delivered the opinion of the Court.
The question presented is whether the fact that the Connecticut Board of Pardons has granted approximately three-fourths of the applications for commutation of life sentences creates a constitutional “liberty interest” or “entitlement” in life-term inmates so as to require that Board to explain its reasons for denial of an application for commutation.
*460I
In 1964, respondent Dumschat was sentenced to life imprisonment for murder. Under state law, he was not eligible for parole until December 1983.1 The Connecticut Board of Pardons is empowered to commute the sentences of life inmates by reducing the minimum prison term,2 and such a commutation accelerates eligibility for parole.3 The authority of the Board of Pardons derives from Conn. Gen. Stat. § 18-26 (1981), which provides in pertinent part:
“(a) Jurisdiction over the granting of, and the authority to grant, commutations of punishment or releases, conditioned or absolute, in the case of any person convicted of any offense against the state and commutations from the penalty of death shall be vested in the board of pardons.
“(b) Said board shall have authority to grant pardons, conditioned or absolute, for any offense against the state at any time after the imposition and before or after the service of any sentence.”
*461On several occasions prior to the filing of this suit in February 1976, Dumschat applied for a commutation of his sentence. The Board rejected each application without explanation. Dumschat then sued the Board under 42 U. S. C. § 1983, seeking a declaratory judgment that the Board’s failure to provide him with a written statement of reasons for denying commutation violated his rights guaranteed by the Due Process Clause of the Fourteenth Amendment.
After hearing testimony from officials of the Board of Pardons and the Board of Parole, the District Court concluded (a) that Dumschat had a constitutionally protected liberty entitlement in the pardon process, and (b) that his due process rights had been violated when the Board of Pardons failed to give “a written statement of reasons and facts relied on” in denying commutation. 432 F. Supp. 1310, 1315 (1977). The court relied chiefly on a showing that “at least 75 percent of all lifers received some favorable action from the pardon board prior to completing their minimum sentences” and that virtually all of the pardoned inmates were promptly paroled.4 Id., at 1314. In response to postjudgment motions, the District Court allowed other life inmates to intervene, certified the suit as a class action, and heard additional evidence.5 *462The court held that all prisoners serving life sentences in Connecticut state prisons have a constitutionally protected expectancy of commutation and therefore that they have a right to a statement of reasons when commutation is not granted. The Court of Appeals affirmed. 593 F. 2d 165 (CA2 1979). A petition for a writ of certiorari was filed, and we vacated and remanded for reconsideration in light of Greenholtz v. Nebraska Penal Inmates, 442 U. S. 1 (1979). 442 U. S. 926 (1979).
On remand, the Court of Appeals reaffirmed its original decision, 618 F. 2d 216 (CA2 1980), stating:
“In marked contrast [to the Nebraska statute considered in Oreenholtz], Connecticut’s pardons statute contains neither a presumption in favor of pardon nor a list of factors to be considered by the Board of Pardons. Instead, the statute grants the board unfettered discretion in the exercise of its power. The statute offers only the 'mere hope’ of pardon; it does not create a legitimate expectation of freedom and therefore does not implicate due process.” Id., at 219 (citation omitted).
The Court of Appeals also noted that the District Court’s holding that the mere possibility of a pardon creates a constitutionally cognizable liberty interest or entitlement was “no longer tenable” in light of Greenholtz. 618 F. 2d, at 221; see 442 U. S., at 8-11. However, the Court of Appeals then proceeded to conclude that “[t]he overwhelming likelihood that Connecticut life inmates will be pardoned and released before they complete their minimum terms gives them a constitutionally protected liberty interest in pardon pro*463ceedings.” 618 F. 2d, at 220. The Court of Appeals also understood our opinion in Greenholtz to hold that under the Due Process Clause, a brief statement of reasons is “not only constitutionally sufficient but also constitutionally necessary.”6 618 F. 2d, at 222. On that reading of Greenholtz, the case was remanded to the District Court for a determination of “how many years life inmates must serve before the probability of pardon becomes so significant as to give rise to a protected liberty interest.”7
II
A
A state-created right can, in some circumstances, beget yet other rights to procedures essential to the realization of the parent right. See Meachum v. Fano, 427 U. S. 215, 226 (1976); Wolff v. McDonnell, 418 U. S. 539, 557 (1974). Plainly, however, the underlying right must have come into existence before it can trigger due process protection. See, e. g., Leis v. Flynt, 439 U. S. 438, 442-443 (1979).
In Greenholtz, far from spelling out any judicially divined “entitlement,” we did no more than apply the unique Nebraska statute. We rejected the claim that a constitutional entitlement to release from a valid prison sentence exists in-*464dependency of a right explicitly conferred by the State. Our language in Greenholtz leaves no room for doubt:
“There is no constitutional or inherent right of a convicted person to be conditionally released before the expiration of a valid sentence. The natural desire of an individual to be released is indistinguishable from the initial resistance to being confined. But the conviction, with all its procedural safeguards, has extinguished that liberty right: ‘[G]iven a valid conviction, the criminal defendant has been constitutionally deprived of his liberty.’ ” 442 U. S., at 7 (emphasis supplied; citation omitted).
Greenholtz pointedly distinguished parole revocation and probation revocation cases,8 noting that there is a “critical” difference between denial of a prisoner’s request for initial release on parole and revocation of a parolee’s conditional liberty. Id., at 9-11, quoting, inter alia, Friendly, “Some Kind of Hearing,” 123 U. Pa. L. Rev. 1267, 1296 (1975). Unlike probation, pardon and commutation decisions have not traditionally been the business of courts; as such, they are rarely, if ever, appropriate subjects for judicial review.9 Cf. Meachum v. Fano, supra, at 225.
A decision whether to commute a long-term sentence generally depends not simply on objective factfinding, but also on purely subjective evaluations and on predictions of future behavior by those entrusted with the decision. A commutation decision therefore shares some of the characteristics of a decision whether to grant parole. See Greenholtz, 442 U. S., at 9-10. Far from supporting an “entitlement,” Greenholtz therefore compels the conclusion that an inmate has “no constitutional or inherent right” to commutation of his sentence.
*465Respondents nevertheless contend that the Board’s consistent practice of granting commutations to most life inmates is sufficient to create a protectible liberty interest. They argue:
“[T]he State Board has created an unwritten common law of sentence commutation and parole acceleration for Connecticut life inmates. ... In effect, there is an unspoken understanding between the State Board and inmates. The terms are simple: If the inmate cooperates with the State, the State will exercise its parole power on the inmate’s behalf. Both the State and the inmate recognize those terms. Each expects the other to abide by them.” Brief for Respondents 17-18.
This case does not involve parole, and respondents’ argument wholly misconceives the nature of a decision by a state to commute the sentence of a convicted felon. The petition in each case is nothing more than an appeal for clemency. See Schick v. Reed, 419 U. S. 256, 260-266 (1974). In terms of the Due Process Clause, a Connecticut felon’s expectation that a lawfully imposed sentence will be commuted or that he .will be pardoned is no more substantial than an inmate’s expectation, for example, that he will not be transferred to another prison;10 it is simply a unilateral hope. Greenholtz, supra, at 11; see Leis v. Flynt, 439 U. S., at 443-444. A constitutional entitlement cannot “be created — as if by estoppel — merely because a wholly and expressly discretionary state privilege has been granted generously in the past.” Id., at 444, n. 5. No matter how frequently a particular form of clemency has been granted, the statistical probabilities standing alone generate no constitutional protections; a contrary conclusion would trivialize the Constitution. The ground for a constitutional claim, if any, must be found in statutes or other rules defining the obligations of the authority charged with exercising clemency.
*466B
The Court of Appeals correctly recognized that Connecticut has conferred “unfettered discretion” on its Board of Pardons, but — paradoxically—then proceeded to fetter the Board with a halter of constitutional “entitlement.” The statute imposes no limit on what procedure is to be followed, what evidence may be considered, or what criteria are to be applied by the Board. Respondents challenge the Board’s procedure precisely because of “the absence of any apparent standards.” Brief for Respondents 28. We agree that there are no explicit standards by way of statute, regulation, or otherwise.
This contrasts dramatically with the Nebraska statutory procedures in Greenholtz, which expressly mandated that the Nebraska Board of Parole “shall” order the inmate’s release “unless” it decided that one of four specified reasons for denial was applicable. 442 U. S., at 11. The Connecticut commutation statute, having no definitions, no criteria, and no mandated “shalls,” creates no analogous duty or constitutional entitlement.
It is clear that the requirement for articulating reasons for denial of parole in Greenholtz derived from unique mandates of the Nebraska statutes. Thus, although we noted that under the terms of the Nebraska statute, the inmates’ expectancy of parole release “is entitled to some measure of constitutional protection,” we emphasized that
“this statute has unique structure and language and thus whether any other state statute provides a protectible entitlement must be decided on a case-by-case basis.” Id., at 12.
Moreover, from the standpoint of a reasons requirement, there is a vast difference between a denial of parole — particularly on the facts of Greenholtz — and a state’s refusal to commute a lawful sentence. When Nebraska statutes directed that inmates who are eligible for parole “shall” be released “unless” *467a certain finding has been made, the statutes created a right. By contrast, the mere existence of a power to commute a lawfully imposed sentence, and the granting of commutations to many petitioners, create no right or “entitlement.” A state cannot be required to explain its reasons for a decision when it is not required to act on prescribed grounds.
We hold that the power vested in the Connecticut Board of Pardons to commute sentences conferred no rights on respondents beyond the right to seek commutation.
Reversed.