Dom Peter, Duke of Coimbra, KG (; ), (9 December 1392 – 20 May 1449) was a Portuguese infante (prince) of the House of Aviz, son of King Dom John I of Portugal and his wife, Philippa of Lancaster, daughter of John of Gaunt. In Portugal, he is known as Infante Dom Pedro das Sete Partidas [do Mundo], "of the Seven Parts [of the World]" because of his travels. Possibly the best-travelled prince of his time, he was regent between 1439 and 1448. He was also 1st Lord of Montemor-o-Velho, Aveiro, Tentúgal, Cernache, Pereira, Condeixa and Lousã. Early life From the time he was born, Peter was one of John I's favourite sons. Along with his siblings, he received an exceptional education rarely seen in those times for the children of royalty. Close to his brothers Edward, the future king of Portugal, and John, Lord of Reguengos de Monsaraz, Peter grew up in a calm environment free of intrigues. On 14 August 1415, he accompanied his father and brothers Edward and Henry for the Battle of Ceuta in Morocco. His mother had died the previous month, giving each of her sons on her deathbed an arming sword she had ordered forged for them. Peter refused to be knighted before showing valour in battle, and he was knighted along with his brothers the following day; he was also created Duke of Coimbra. His younger brother Henry was made Duke of Viseu. These were the first dukedoms created in Portugal. On finishing a translation of Seneca's De Beneficiis in 1418, he initiated extensive travels throughout Europe, which would keep him away from Portugal for the next ten years. After meeting with John II of Castile in Valladolid, he continued to Hungary, where he met with the Holy Roman Emperor Sigismund, and entered his service. He fought with the Imperial armies against the Turks and in the Hussite Wars in Bohemia and was awarded the march of Treviso in Northern Italy in 1422. In 1424 he left the Holy Roman Empire, meeting first with Murad II, Sultan of the Ottoman Empire, on the island of Patmos, and then continuing to Constantinople, capital of the Byzantine Empire; the hopeless position of the city against the Ottoman onslaught did not fail to impress him. From Constantinople he travelled to the Holy Land via Alexandria and Cairo. European travels In 1425, Peter travelled to France and