 The Senior's prerogatives also included control over the Duchy of Silesia and his Pomerelian vassals at Gdańsk in eastern Pomerania.The Senior was tasked with defense of borders, the right to have troops in provinces of other Dukes, carrying out the foreign policy, supervision over the clergy (including the right to nominate bishops and archbishops), and minting the currency.The High duke generally had his own principality (province, dukedom), which he had inherited within his own branch of the Piast dynasty, and left to his personal heirs within his own branch, whereas Kraków followed the seniorate (fell to the oldest of them).