Антон Ульрих
After the Ernest Augustus had received the new ninth prince-electorship from Emperor Leopold I in 1692 and went on to rule as Elector of Hanover, tensions between the two states rose, as both Anthony Ulrich and Rudolph Augustus were dismayed that they had not received the electorship according to the right of primogeniture. While both Hanover under Ernest Augustus' son Elector George Louis and the Welf Principality of Lüneburg sided with the Habsburg emperor in the War of the Spanish Succession, Anthony Ulrich decided to enter into an agreement with King Louis XIV of France. This led to Hanover and Lüneburg forces invading the Principality of Wolfenbüttel in March 1702; Anthony Ulrich was almost captured while travelling from his Wolfenbüttel residence to Brunswick. By order of the emperor, Anthony Ulrich was deposed as duke against his brother's protestations, and Rudolph Augustus remained as the only Wolfenbüttel ruler, while Anthony Ulrich fled to Saxe-Gotha. In April 1702, Rudolph Augustus signed a treaty with Hanover and Lüneburg that Anthony Ulrich later agreed to.