Estrid Svendsdatter

Estrid Svendsdatter (born c. 990, died after 1057) was a Danish princess, daughter of Sweyn Forkbeard and half-sister of Cnut the Great. She married Ulf Jarl, who ruled Denmark until Cnut had him killed in 1026. Her son Sweyn Estridsson became king in 1047 and gave the Estridsen dynasty her name.

She held great estates across Denmark and was one of the North's richest women; tradition says she replaced Roskilde's timber church with its first stone church, where she was buried.