| Conventional Long Name: | Duchy of Lubiszewo |
| Era: | High Middle Ages |
| Status: | Vassal of the Duchy of Gdańsk (1227/1233–1236, 1239–1243) Vassal of the State of the Teutonic Order (1251–1269) |
| Government Type: | Duchy |
| Life Span: | 1227/1233–1236 1239–1243 1251–1269 |
| Year Start: | 1227/1233 |
| Event Start: | Partition of the Duchy of Świecie and Lubiszewo |
| Event1: | Incorporation into the Duchy of Gdańsk |
| Date Event1: | 1236 |
| Event2: | Reestablishment of the state |
| Date Event2: | 1239 |
| Event3: | Incorporation into the Duchy of Gdańsk |
| Date Event3: | 1242 |
| Event4: | Reestablishent of the state |
| Date Event4: | 1251 |
| Event End: | Incorporation into the Duchy of Świecie |
| P1: | Duchy of Świecie and Lubiszewo |
| P2: | Duchy of Gdańsk |
| S1: | Duchy of Gdańsk |
| S2: | Duchy of Świecie |
| Religion: | Roman Catholic |
| Capital: | Lubiszewo (1227/1233–1252/1253) Tczew (1252/1253–1270) |
| Today: | Poland |
| Official Languages: | Polish, Latin |
| Title Leader: | Duke |
| Leader1: | Sambor II |
| Year Leader1: | 1227/1233–1236, 1239–1243, 1251–1269 |
Duchy of Lubiszewo, since 1252 or 1253 also known as the Duchy of Lubiszewo and Tczew, and the Duchy of Tczew, was a duchy in the Pomerelia centred around the towns of Lubiszewo and Tczew. Its capital was originally Lubiszewo, and since 1252 or 1253, it was moved to Tczew. Its only ruler was duke Sambor II of the Samboride dynasty.[1]
The state was established between 1227 and 1233, in the partition of the Duchy of Świecie and Lubiszewo, as the vassal of the Duchy of Gdańsk.[2] [3] It existed until 1236, when it got conquered by the Duchy of Gdańsk during the war between two countries.[4] It was reestablished in 1239 by Swietopelk II, Duke of Gdańsk, as his vassal, with Sambor II being allowed to return on the throne.[5] It got again incorporated into the Duchy of Gdańsk in 1243.[6] It was re-established in 1251 as the vassal of the State of the Teutonic Order.[4] It existed until 1269, when it got incorporated into the Duchy of Świecie during the civil war in Pomerelia.[7]