Siemowit of Dobrzyń

Siemowit of Dobrzyń (pl: Siemowit dobrzyński; c. 1262/67 – 1312), was a Polish prince member of the House of Piast, Duke of Brześć Kujawski during 1267–1288, Duke of Dobrzyń during 1288–1293, 1295–1303 and 1305–1312, during 1293–1295 in captivity in Lithuania, during 1303–1305 deposed, after 1306 hereditary vassal of the Kingdom of Poland. He was the fifth son of Casimir I of Kuyavia, but the third born from his third marriage with Euphrosyne, daughter of Casimir I of Opole.

Siemowit of Dobrzyń

Siemowit of Dobrzyń (pl: Siemowit dobrzyński; c. 1262/67 – 1312), was a Polish prince member of the House of Piast, Duke of Brześć Kujawski during 1267–1288, Duke of Dobrzyń during 1288–1293, 1295–1303 and 1305–1312, during 1293–1295 in captivity in Lithuania, during 1303–1305 deposed, after 1306 hereditary vassal of the Kingdom of Poland. He was the fifth son of Casimir I of Kuyavia, but the third born from his third marriage with Euphrosyne, daughter of Casimir I of Opole.