Calvinists. When Don Juan signed the Perpetual Edict in February 1577, promising to comply with the conditions of the Pacification of Ghent, it seemed that the war had been decided in favour of the rebels. However, after Don Juan took the city of Namur in 1577, the uprising spread throughout the entire Netherlands. Don Juan attempted to negotiate peace, but the prince intentionally let the negotiations fail. On 24 September 1577, he made his triumphal entry into Brussels, the capital. At the same time, Calvinist rebels grew more radical, and attempted to forbid Catholicism in areas under their control. William was opposed to this both for personal and political reasons. He desired freedom of religion, and he also needed the support of the less radical Protestants and Catholics to reach his political goals. On 6 January 1579, several southern provinces, unhappy with William's radical following, signed the Treaty of Arras, in which they agreed to accept their Catholic governor, Alessandro Farnese, Duke of Parma (who had succeeded Don Juan). Five northern provinces, later followed by most cities in Brabant and Flanders, then signed the Union of Utrecht on 23 January, confirming their unity. William was initially opposed to the Union, as he still hoped to unite all provinces. Nevertheless, he formally gave his support on 3 May. The Union of Utrecht would later become a de facto constitution, and would remain the only formal connection between the Dutch provinces until 1797. Declaration of Independence In spite of the renewed union, the Duke of Parma was successful in reconquering most of the southern part of the Netherlands. Because he had agreed to remove the Spanish troops from the provinces under the Treaty of Arras, and because Philip II needed them elsewhere subsequently, the Duke of Parma was unable to advance any further until the end of 1581. In March 1580 Philip issued a royal ban of outlawry against the Prince of Orange, promising a reward of 25,000 crowns to any man who would succeed in killing him. William responded with his Apology, a document (in fact written by Villiers) in which his course of actions was defended, the person of the Spanish king viciously attacked, and his own Protestant allegiance restated. In the meantime, William and his supporters were looking for foreign support. The prince had already sought French assistance on several occasions, and this time he managed to gain the