a bohemian vassal from 1329 on, the political weakness of the duchy continued, caused by domestic conflicts between bolesław's sons wenceslaus and louis the fair strengthening the influences of the bohemian monarchs. when in 1419 the legnica branch of the silesian piasts became extinct with the death of duke wenceslaus ii, the duchy was inherited by duke louis ii of brzeg. as louis himself had no male heirs, legnica was annexed as a ceased fief by the bohemian king sigismund in 1436. a long-standing dispute arose, as the late duke louis ii had bequeathed his estates to the sons of his step-brother duke henry ix of lubin –though without the consent of the bohemian overlord. eventually, in 1455 the duchy was inherited by frederick i, the son of louis' daughter hedwig, who was officially enfeoffed by king matthias corvinus in 1469.