I found him! Bavo is on the shutter of Bosch’s masterpiece. Allowin will be the name of my Tolkien Revelation.
A wild, young aristocrat of Brabant, he contracted a beneficial marriage, and had a daughter through it. He was a soldier who led an undisciplined and disorderly life. Shortly after the death of his wife, Bavo decided to reform after hearing a sermon preached by Saint Amand. Struck by the sermon, which was on the emptiness of material things, Bavo was converted to Christianity at Amand’s convent.
For some time thereafter, Bavo joined Amand in the latter’s missionary travels throughout France and Flanders. On one occasion, Bavo met a man whom he had sold into slavery years before. Wishing to atone for his earlier deed, Bavo had the man lead him by a chain to the town jail. Bavo built an abbey on his grounds and became a monk. He distributed his belongings to the poor and lived as a recluse, first in a hollow tree and later in a cell in the forest by the Abbey.
He is most often shown in Christian art as a knight with a sword and falcon. The most popular scene is the moment of his conversion, which has many stories attached to it. Because he is so often shown with a falcon, he came to be considered the patron saint of falconry. In medieval Ghent, taxes were paid on Bavo’s feast day, and it is for this reason he is often shown holding a purse or money bag.