| Birth | 910 | | | | |
| Marriage | 932 | Cyrid Gyrithe Gunhilde Olafsdottir | | | |
| Title (Nobility) | From Abt 958 to 986 | King of Denmark - ascended to the throne with his father Gorm's death in 935, following Gorm's disastrous invasion of Friesland | | | |
| Title (Nobility) | From Abt 970 to 986 | King of Norway - After the assassination of King Harald Graafeld of Norway, Harald attempted to add Norway to his lands, but was only briefly successful before being forced to withdraw. | | | |
| Religion | 972 | forced to accept baptism in the Christian church | | | |
| Religion | By 980 | removed the royal residence to Roeskilde and built a church there, and promoted the spread of the new religion | | | |
| Death | 1 Nov 988 | Jomsborg | | | |
| Marriage | | Senfria Eriksdatter | | | |
| Occupation | | Harald began his reign by strengthening the Danawirk series of fortifications in an attempt to create a barrier between the Holy Roman Empire and Denmark, and consolidated the kingdom won by his father. | | | |
| Religion | | known for making the Danes Christian | | | |
| Burial | | Roskilde Cathedral, Roskilde, Roskilde Kommune, Sjælland, Denmark | | | |