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In the January of the following year he participated to the coronation of Charles the Bald in Pavia, and received by the new king further territories at Cavenago, Vimercate and Ornago.
He served his cousin Charles the Bald in both war and peace, carrying out two missions to Lothar during the Carolingian civil war and fighting at Fontenoy in June 841.
Lay abbot of Saint-Loup, he was mentioned for the first time on 25 October 874, when he appeared in a charter of Charles the Bald ceding Chaource, in Tonnerre, to the abbey.
The Treaty of Meerssen or Mersen, concluded on 8 August 870, was a treaty of partition of the realm of Lothair II by his uncles Louis the German of East Francia and Charles the Bald of West Francia, the two surviving sons of Emperor Louis I the Pious.
Ermentrude of Orléans (823-869), wife of Holy Roman Emperor and King of West Francia Charles the Bald
Charles the Bald, however, upheld the rights of Ansegisus at the synod of Ponthion.
In 847 Lupus accompanied Charles the Bald to a conference at Meerssen, whereby the three brothers again swore peace with one other.
By a charter dated 25 October 876, Charles the Bald ceded Chaource, in Tonnerre, to Robert and Odo.
Historian Ferdinand Lot supposed that Sancho was even nominated as duke at Limoges or Orléans by Charles the Bald in that year.