The fortified city of Bremen held its own guards, not allowing prince-archiepiscopal soldiers to enter it. The city reserved an extra very narrow gate, the so-called "Bishop's Needle" (Latin: "Acus episcopi", first mentioned in 1274), for all clergy including the Prince-Archbishop. The narrowness of the gate made it technically impossible to come accompanied by knights. Therefore, the Prince-Archbishops rather preferred to reside outside of the city, first in Bücken and later in the Vörde Castle, which became the principal fortress of Prince-Archbishop "Gerhard II, Edelherr zur Lippe" in 1219.