Teodósio I
D. Teodósio I; Ducal Palace of Vila Viçosa
Duke of Braganza
Tenure	20 September 1532 – 22 September 1563
Predecessor	Jaime I
Successor	João I
Born	1510 Vila Viçosa, Alentejo, Kingdom of Portugal
Died	22 September 1563 Vila Viçosa, Alentejo, Kingdom of Portugal
Spouse	Isabel of Lencastre Beatriz of Lencastre
Issue among others...	João I, Duke of Braganza
House	House of Braganza
Father	Jaime I, Duke of Braganza
Mother	Leonor Pérez de Guzmán

Dom Teodósio I of Braganza (Portuguese: Teodósio de Bragança; 1510 – 22 September 1563) was the 5th Duke of Braganza, among other titles. He is known for ceding the title of Duke of Guimarães to Infante Duarte of Aviz, alongside some of the wealth and properties of the House of Braganza.

The Duke Teodósio I was an educated and refined man, a typical Renaissance prince. He loved painting and sculpture.

In 1542, he married his 1st cousin Isabel of Lencastre (1513–1558), daughter of his uncle Dinis, and had John (João) I of Braganza, who succeeded him as 6th Duke of Braganza.

In 1559, he remarried with Beatriz of Lencastre (1542–1623), granddaughter of Infante George of Lencastre, Duke of Coimbra. Their first child, Jaime of Braganza, died without issue in 1578, in the Battle of Alcacer Quibir. Their second child, Isabel, married the 1st Duke of Caminha.

• "Nobreza de Portugal e Brasil" Vol. II, page 445. Published by Zairol Lda., Lisbon, 1989.
• Genealogy of Duke Teodósio I of Braganza (in Portuguese)
• VILA-SANTA, Nuno, "O Duque como conselheiro: D. Teodósio e a Coroa em meados de Quinhentos" [1]

Media related to Teodosio I of Braganza at Wikimedia Commons

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