The Capitulary of Servais was the implementation of an agreement between Charles the Bald and his half-brother Lothar to maintain the peace.
In a conference of Charles and Lothar at Valenciennes in 853, the missi [literally, the sent ones] were re-established after a long hiatus.
The Diet of Servais confirmed the decisions arrived at during the conference.
The Capitulary of Servais was enacted by Charles in November 853 dividing the Franco-Burgundian portion of Charles’ realm into twelve districts (missatica) to enforce the measures of this agreement.
According to Nelson, the twelve missicati and associated missi were: See also Capitularies of Charles the Bald.