Giovanni or Jean Cossa (probably 29 March 1400 - 30 October 1476) was lieutenant general of Provence, seneschal of Rene of Anjou and grand seneschal of Provence.
[1]
The so-called portrait of Giovanni Cossa, actually showing Jacopo Antonio Marcello - a miniature from the
Martyrdom of Saint Maurice and his Comrades
, sent from Marcello to Cossa on 1 June 1453 as a diplomatic gift.