Beginning in 1675 Albert de Hornes was regularly named as a potential candidate for a vacant diocese in the ecclesiastical provinces of Mechelen and Cambrai.
On 10 September 1680 King Charles II of Spain appointed him Bishop of Ghent, succeeding Ignace Schetz de Grobbendonk.
Since 1623 (when Bishop Antoine Triest received it from Cardinal Infante Ferdinand of Austria), Saint Bavo's Cathedral had been the episcopal palace.
Albrecht van Horne (1642-1694): Albertus Dei & apostolicæ sedis gratia episcopus Gandavensis [...] salutem in Domino.
Cupientes quantum in nobis est omni indebito sacro-sancti missæ sacrificij exercitio occurrere.