"that dead knight in Ravenna, whos marble body seems alive, almost liquid"
The English patient is compared to the statue of a knight at rest on his tomb. He is being imbued with the qualities of a crusader knight, a saintliness.
Ravenna is a city in Italy, which during the Medieval period was host to the exiled Dante Alighieri, considered one of the greatest Italian writers.
The Divine Comedy by Dante Alighieri