• Petrus Abailardus, Latin name for
Peter Abelard (1079–1142) •
Petrus de Abano (''Pietro d'Abano''; 1257–1315), Italian philosopher and doctor •
Petrus Alphonsi (fl. 1106–1110), Spanish Jewish writer •
Petrus Augustus (545–602), Byzantine curopalates •
Petrus Aureolus (1280–1322), French theologian •
Petrus Baldus de Ubaldis (1327–1400), Italian jurist •
Petrus Bernardinus (1475–1502), Florentine sectarian •
Petrus Bertius (
Pieter de Bert; 1565–1629), Flemish theologian, historian, geographer and cartographer •
Petrus Bonus (
Pietro Boni; fl. 1330s), Italian alchemist •
Petrus Canisius (
Pieter Kanis; 1521–1597), Dutch Jesuit Catholic theologian •
Petrus Capuanus (fl. 1197–1214), Italian scholastic •
Petrus Christus (ca. 1410/1420 – ca. 1475/76), Dutch painter •
Petrus Comestor (
Pierre le Mangeur; died c.1178), French theological writer and university administrator •
Petrus de Cruce (fl. 1290–1302), Italian cleric, composer, and author •
Petrus Cunaeus (
Peter van der Kun; 1586–1638), Dutch philosopher •
Petrus de Dacia (1230s–1289), Swedish monk, first author in Sweden •
Petrus Dasypodius (
Peter Hasenfratz, ca. 1495–1559), Swiss humanist •
Petrus Dathenus (
Pieter Datheen; c.1531–1588), Dutch Calvinist theologian •
Petrus Diaconus (
Pietro Diacono; c.1110–c.1159), Italian librarian of Montecassino •
Petrus Divaeus (
Pieter van Dieven;1535–1581), Flemish historian •
Petrus Dorlandus (
Peter van Diest; 1451–1507), Flemish writer of the play
Elckerlijc (translated into
Everyman) •
Petrus Forestus (
Pieter van Foreest; 1521–1597), Dutch physician •
Petrus de Natalibus (fl. 1400), Venetian hagiographer •
Petrus Peregrinus or Peter de Maricourt (fl. 1269), French writer on magnetism and astrolabes •
Petrus Plancius (
Pieter Platevoet; 1552–1622), Netherlandish astronomer, cartographer and clergyman •
Petrus Ramus (1515–1572), French humanist, logician, and educational reformer ==Modern given name==