- Bishops--Appointment, call, and election1
- Bona, Queen, consort of Sigismund I, King of Poland, 1494-15571
- Bread1
- Buonamici, Giovanni Francesco1
- California--Berkeley1
- Camporitondo, Bartolomeo1
- Capponi, Alvisia1
- Capponi, Ludovico, 1533-16141
- Capponi, Niccolò1
- Carli, Giovanfrancesco de'1
- Catholic Church1
- Catholic Church. Diocese of Cortona (Italy)1
- Catholic Church. Diocese of Pistoia (Italy)1
- Celleri, Azzo1
- Celleri, Fabrizio1
- Celleri, Ippolita1
- Charles V, Holy Roman Emperor, 1500-15581
- Chellini, Bartolomeo1
- Christian heretics1
- Church finance1