 Bathory thanked Zamoyski by granting him the office of Deputy Chancellor on 16 May 1576 . He participated on Batory 's side in the quelling of the Danzig rebellion in 1576 – 1577 , sponsoring a chorągiew of pancerni ( cavalry unit ) and participating in close combat on several occasions . In 1577 he married again , this time marrying Krystyna Radziwiłł , daughter of magnate Mikołaj Radziwiłł Czarny ; this made him a close ally of the Radziwiłł family , the most powerful family in the Grand Duchy of Lithuania . In 1578 he received the post of the Grand Crown Chancellor . That year poet Jan Kochanowski dedicated his Odprawa Posłów Greckich , the first Polish tragedy , to him . 
