Jenštejnové or z Jenštejna was branch of family of Jan Očko z Vlašimě and his brothers Michael and Pavel z Vlašimě.
Pavel z Vlašimě was listed in 1360 as a royal notary and given castle Jenštejn in 1368. He used surname z Jenštejna and was founder of branch Jenštejnští. He had four sons: Martin, Jan, Pavel and Václav. The most important was Jan z Jenštejna, who following the resignation of his uncle Jan Očko z Vlašime became the 1378 Prague Archbishop.
Vaněk z Jenštejna, son of Pavel z Jenštejna, was owner of castle Bradlec and Staré Hrady near Jičín. Vaněk rebelled against the King Václav IV. and Bradlec was taken by the royal army in 1417. His son Mikuláš (+ 1459) was last lord z Jenštejna.
Coat of Arms z Jenštejna is silver a two Vulture heads gules