The convent of St. Silvester was founded, endowed, and protected by the Colonna cardinals, for the daughters of the family who embraced a monastic life, and who, in the year 1318, were twelve in number. The others were allowed to marry with their kinsmen in the fourth degree, and the dispensation was justified by the small number and close alliances of the noble families of Rome (Memoires sur Petrarque , tom. i. p. 110, tom. ii. p. 401).