Siedlce is a city in eastern Poland with 77,354 inhabitants. Situated in the Masovian Voivodeship, previously the city was the capital of a separate Siedlce Voivodeship (1975–1998). The city is situated between two small rivers, the Muchawka and the Helenka, and lies along the European route E30, around 90 kilometres (56 mi) east of Warsaw. It is the fourth largest city of the Voivodeship, and the seat of the Roman Catholic Diocese of Siedlce. Siedlce is a local educational, cultural and business center.

The House of Ogiński, feminine form: Ogińska, plural: Ogińscy was a noble family of Grand Duchy of Lithuania and Poland, member of the Princely Houses of Poland.