John Sigismund ceased to style himself king of Hungary after the Treaty of Speyer of 1570, under which he adopted the title of "Prince of Transylvania and Lord of parts of the Kingdom of Hungary".[111][112] His successor Stephen Báthory (who was elected ruler by the assembly of the Three Nations) revived the title of voivode, initially for himself.[113] He adopted the title of "prince of Transylvania" when he was elected king of Poland in 1576.[114] At the same time, he conferred the title voivode on his brother Christopher in 1576.[114] Christopher Báthory was followed in 1581 by his minor son Sigismund who continued to style himself voivode until the death of his uncle, Stephen Báthory in 1586.[115] Sigismund Báthory's title of prince was acknowledged in 1595 by Emperor Rudolph (also king of Hungary).[115]