Giovanni Ram was a Spanish merchant living with his family in the Santo Stefano parish of Venice during the sixteenth century. His private collection of art contained works by Vicenzo Catena, Giorgio da Castelfranco, Jan van Scorel, and Titian. Ram commissioned The Baptism of Christ from Titian and, as patron, was included in the bottom right corner of the work.
Michiel, Marcantonio. Notizia d'opere di disegno nella prima metà del secolo XVI, esistenti in Padova, Cremona, Milano, Pavia, Bergamo, Crema e Venezia. Jacopo Morelli, 1800, p. 78-79, 223.
Schmitter, Monika. ""Virtuous Riches": The Bricolage of Cittadini Identities in Early-Sixteenth-Century Venice." Renaissance Quarterly 57, no. 3 (2004): 908-69. (927 has the information about the Baptism painting)