Thierry I Duke of Upper Lotharingia

✓ Thierry I, Duke of Upper Lotharingia ('dux Barrensis') (b. [962/72], d. 11 Apr 1027), son of Duke Frederick I and Beatrice of France (Gesta Episcoporum Virdunensium: 'Theoderici ducis Barrensis' son of 'ducis Frederici et Beatrici, Hugonis Capitonis Francorum regis soror'); m. by 992 Richilde; father of Frederick II, who predeceased him. Source: Medieval Lands (fmg.ac, Cawley), 'Lotharingia'. [DIRECT ANCESTOR OF THE COMPILER: flag added 22 Oct 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]