Events in History Mar 30 Boudouin IV with the Beard becomes earl of Flanders Jul 10 The city of Dublin is founded on the banks of the river Liffey Deaths in History Mar 30 Arnulf II, count of Flanders (965-988), dies May 6 Dirk II, West Frisian count of Holland May 19 Dunstan, English archbishop of Canterbury, Abbot of Glastonbury Abbey, illustrator and silversmith, dies at about 79 987 AD On This Day in History by Year 989 AD