Matilda of Frisia was the second wife and first Queen

Queen consort

A queen consort is the wife of a reigning king. A queen consort usually shares her husband's rank and holds the feminine equivalent of the king's monarchical titles. Historically, queens consort do not share the king regnant's political and military powers. Most queens in history were queens consort...

 of Henry I, King of the Franks

Henry I of France

Henry I was King of France from 1031 to his death. The royal demesne of France reached its smallest size during his reign, and for this reason he is often seen as emblematic of the weakness of the early Capetians...

. She was the daughter of Liudulf

Liudolf, Margrave of Frisia

Liudolf of Brunswick was margrave of Frisia, count of Brunswick, count in the Derlingau and the Gudingau. He was a member of the Brunonen family....

, Margrave

Margrave

A margrave or margravine was a medieval hereditary nobleman with military responsibilities in a border province of a kingdom. Border provinces usually had more exposure to military incursions from the outside, compared to interior provinces, and thus a margrave usually had larger and more active...

 of Frisia

Frisia

Frisia is a coastal region along the southeastern corner of the North Sea, i.e. the German Bight. Frisia is the traditional homeland of the Frisians, a Germanic people who speak Frisian, a language group closely related to the English language...

 and Gertrude. Her date of birth is unknown.

Matilda and Henry were married in 1043 after the death of his first wife, also named Matilda, daughter of the Emperor Conrad II

Conrad II, Holy Roman Emperor

Conrad II was Holy Roman Emperor from 1027 until his death.The son of a mid-level nobleman in Franconia, Count Henry of Speyer and Adelaide of Alsace, he inherited the titles of count of Speyer and of Worms as an infant when Henry died at age twenty...

. She died the following year during a Caesarean section

Caesarean section

A Caesarean section, is a surgical procedure in which one or more incisions are made through a mother's abdomen and uterus to deliver one or more babies, or, rarely, to remove a dead fetus...

. Henry married Anne of Kiev

Anne of Kiev

Anne of Kiev was the queen consort of France as the wife of Henry I, and regent for her son Philip I.Her parents were Yaroslav I the Wise and princess Ingegerd Olofsdotter of Sweden....

after her death.