After the death of bishop
Jan van Virneburg in 1371, the cathedral
chapter nominated its provost Zweder Uterlo as candidate for the bishopric, but the rest of the chapters supported the papal candidate Arnold van Horne, who as a result become bishop. Arnold seems to have been a forceful bishop, though he endangered the financial state of the bishopric. In 1371, Arnold involved himself in the
Guelders War of Succession, choosing the side of duchess-pretender
Mechteld of Guelders. This involvement almost led to his capture in
Tiel in September 1372 as well as
William II, Duke of Jülich burning down several villages in the bishopric of Utrecht (
Amerongen,
Doorn,
Zeist en
De Bilt). It also put a financial strain on the bishopric. From 1373 to 1375 Arnold also waged war against the
County of Holland and its
duke Albert over the advantageously located trading town of
Vreeswijk. These actions had little results however, while they cost a lot of money. While the western border of the
Sticht was re-enforced and the Hollandic advance was halted, Holland still held the mouth of the rivers
Vecht and
Lek, which kept Utrecht isolated. Bishop Arnold was forced to grant participation to the Utrecht
burghers in the administration of the land, in the
Stichtse Landbrief (Land Letter of the Diocese) of 17 May 1375, after which they accepted new taxes in order to straighten out the financial status of the bishopric. This
Landbrief is an important document that is considered the first constitution of the
Nedersticht. Now that the conflicts had been halted, an old party struggle in the city erupted again, with the
Gunterlingen on one side and the
Lichtenbergers on the other side. Bishop Arnold managed to keep the parties separate. During his tenure as bishop of Utrecht, Arnold also besieged several castles, such as Puttenstein in 1375 and Loenersloot in 1377. == Bishop of Liège ==