Mysterious black stone

Dated August 1523, this sculpted lintel carries the name of the Loïs Serre armouries, canon of Clans, who was the personal secretary to Honoré I, Baron of Beuil.
Was it being reused (recovered from the castle, for instance) or was it an original element. It is impossible to be sure if Loïs Serre really lived at this location in the village. On the other hand, his prestige was so great in Beuil and in the stronghold that the Baron, who was often retained in Nice, delegated his powers to Serres.
Thus we find his armouries in Clans and he is represented as a donor for a mural in 1513 at Roubion.