• Born: Between 928 and 933
• Married (1): Before 27 Jun 947
• Married (2): Abt Nov 951, Pavia, Italy
• Died: 16 Dec 999, Kloster Selz, Alsace, France

  Research Notes:

Luitprand names "Adelegidam" as daughter of Rudolf and his wife Berta, when recording her marriage to "regi Lothario". Her birth date range is estimated from her having given birth to one child by her first marriage before the death of her husband in 950. She claimed the kingdom of Italy on the death of her husband, as the daughter of one of the rival claimants for the throne earlier in the century. Willa, wife of Berengario di Ivrea who had been proclaimed king at Pavia 15 Dec 950, ordered Adelais's imprisonment at Como 20 Apr 951 and "afflicted her with imprisonment and hunger" according to Thietmar. Otto I King of Germany used her ill-treatment as an excuse to invade Italy in Sep 951, although Adelais had succeeded in escaping 20 Aug 951 to Reggio. King Otto entered Pavia 23 Sep 951, proclaimed himself King of Italy, and married Adelais as her second husband. The Annalista Saxo records "Adelheidam reginam" as "coniuge rege Lothario" when she married Otto. Flodoard refers to "uxorem quoque Lotharii regis defuncti, filii Hugonis, sororem Chonradi regis" when recording her second marriage. She was crowned empress at Rome with her husband 2 Feb 962. "Aleidis sororis" is named in the charter of "Chuonradus rex" dated 8 Apr 962. "Adelheidis imperatrix cum filia Athelheidhe abbatissa in Italiam profecta est propter quasdam discordias inter se et filium factas", although it is unclear to whom "filia Athelheidhe" refers unless this is an error for her daughter Mathilde. She replaced her daughter-in-law as regent for her grandson King Otto III in 991.

The necrology of Fulda records the death "999 XVII Kal Ian" of "Adalheid imperatrix". ¹