Cardinals bear no tuft or "pom" (they are given their birettas and zucchettos by the Pope who elevated them in a ceremony named a consistory – they will form a line, and kneel before him when receiving them), bishops bear a purple pom, priests who have been appointed as prelates to certain positions within the Vatican wear a black biretta with red pom, diocesan priests and deacons wear a black biretta with or without a black pom. It is often asserted that seminarians are only entitled to wear a biretta without a pom-pom, but there would seem to be no formal ruling on this point. Priests in monastic and mendicant religious orders that have their own habits (Benedictines, Franciscans, Dominicans, etc.) do not generally wear birettas: in most circumstances, even liturgical, the monastic hood took the place of the biretta. Canons Regular generally do—for instance the canons of the Order of Prémontré wear a white biretta. Clerks Regular (that is, post-Renaissance religious orders primarily dedicated to priestly ministry, for instance the Jesuits and Redemptorists) generally wear a black biretta with no tuft. Other priests who belong to various forms of community life, as the Congregation of the Oratory of St. Philip Neri for instance, generally also wear birettas, but without a pom. The Institute of Christ the King Sovereign Priest uses black birettas with a blue pom.