Battle of lepanto - Info Sought on Giorgio Greco

At the battle of Lepanto in 1571 there was a Giorgio Greco in command of a Genoese Gally (Padrona or flagship) that belonged to the Lomellini family of Genoa.

I am looking for any information available on Giorgio, but I am unsure where to look, or if any of the details of his life have survived since 1571.

In particular, the coat of arms attached belong to a Greco family in Sicily, although I am unsure who was granted these arms or when. The comet in heraldry can signify victory at a great battle, and the 3 seashells can indicate the holy trinity or naval command. I am very interested to know if Giorgio Greco was connected to this Greco family in Sicily. More details on the Greco family of Valdina at the link below (starts 1682 with Balthasar).

Since the crown is a Marquis coronet, I think Ignazio Maria Greco must have been granted these arms first, as he was the first Marquis in the line at the link below.

I recognize this may be a very specific question but I am hoping someone out there knows something that can assist me.

HISTORY OF THE GRECO COAT OF ARMS - ITALIAN TO ENGLISH
 

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