Gaetano dei Conti di Thiene CR (6 October 1480 – 7 August 1547), known as Saint Cajetan, was an Italian Catholic priest and religious reformer, co-founder of the Theatines.

Cajetan was born in October 1480, the son of Gaspar, lord of Thiene, and Mary Porta, persons of the first rank among the nobility of the territory of Vicenza, in Veneto[1] Region.

His interests were as much or more devoted to spiritual healing than the physical kind, and he joined a confraternity in Rome called the "Oratory of Divine Love".

One of his four companions was Giovanni Pietro Carafa, the Bishop of Chieti, elected first superior of the order, who later became pope as Paul IV.

[3] He founded a bank to help the poor and offer an alternative to usurers (who charged high interest rates).

Jesuit missionary Eusebio Kino in 1691 established the mission San Cayetano de Tumacácori in honour of Cajetan.