On 5 June 1564 Groesbeeck was elected Prince-Bishop of Liège; his election was
preconized by
Pope Pius IV on 23 February 1565. In 1574, a letter from
Pope Gregory XIII congratulating Groesbeeck on his conduct was published. In 1576, he became Prince-Abbot of Stavelot. Gregory made him a
cardinal priest in the
consistory of 21 February 1578, but he never traveled to
Rome to receive the
red hat or a
titular church. In 1577, when
Margaret of Valois was travelling to
Spa, Groesbeeck lent her his palace, himself temporarily moving to the
Abbey of Saint-Jacques. The royal visit was the occasion for a series of celebrations, banquets and exchanges of gifts. She described her host as "a lord accompanied by much virtue, prudence and goodness, who speaks French well; agreeable of person, honourable, magnificent and agreeable company." He died on 29 December 1580 and was buried in St. Lambert's Cathedral, Liège. ==References==