Hochmeister Siegfried von Feuchtwangen, Heinrich (and a relative of Gunther von Schwarzburg of the same name) led the Order's forces which relieved Brandenburg's siege of Danzig in 1308, but refused to relinquish the city to King Władysław I the Elbow-high of Poland who did not offer enough reimbursement for the Order's expenses. This led to the Teutonic takeover of Danzig. By the Treaty of Soldin of 1309, Heinrich purchased Brandenburg's claims on Pomerelia for the Order, which then held Danzig and Pomerelia until 1466. In 1314 he attached Navahrudak Castle.