I only know of one Cretan artist, and certainly only one that was active in the Spanish Renaissance. So it didn't really matter which painting was cited; the first three words of this question were enough to narrow my options down to one.
St. Martin of Tours was a Roman soldier who went on to become the third Bishop of Tours (a city in the centre–west of France). According to legend, while he was serving in the Roman army and stationed in Gaul (modern–day France), he met a scantily–clad beggar outside the gates of the city of Amiens. Acting on an impulse, he cut his military cloak in half to share with the man. That night, Martin dreamed of Jesus wearing the half–cloak he had given away. He heard Jesus say to the angels: "Martin, who is still but a catechumen, clothed me with this robe." (A catechumen is a person receiving instruction from a catechist in the principles of the Christian religion, with a view to baptism.) In another version, when Martin woke, he found his cloak restored to wholeness. The dream confirmed Martin in his piety, and he was baptised at the age of 18.
The part of the cloak that Martin kept himself became a famous relic, preserved in the oratory of the Merovingian kings of the Franks at the Marmoutier Abbey near Tours. During the Middle Ages, the supposed relic of St. Martin's miraculous cloak was carried by the king even into battle, and used as a holy relic upon which oaths were sworn.
The priest who cared for the cloak in its reliquary was called a cappellanu – 'capella' being the word for a little cloak – and ultimately all priests who served the military became known as cappellani. The French translation is chapelains, and from this the English word 'chaplain' is derived.
Similarly, the small temporary churches that were built for the relic became known as 'capellae'. They eventually lost their association with the cloak, and 'chapel' became a generic word for any small church.
The above is an edited version of the text from Wikipedia.
The subject of St. Martin and the Beggar is a popular one in art, El Greco's version being one of the best known. Another famous version is by Antony van Dyck.
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