St Gildas mentioned wolves before. When he hurtled through the history of Britain, he referred to the Saxons as being invited 'like wolves into the sheepfold', then later described more 'wolf-cubs' coming to join them.
Maelgwn could technically have been persuaded by Saxons to leave his monastery, but it seems highly unlikely. Particularly when Gildas's earlier references weren't about the standards of any Saxon leader. It was more allegoric. The Pagans were loose amongst the lambs of God.
Gildas also discussed the legend of Britain's foremost Christian martyr St Alban. After the saint performed a miracle en route to his death, his executioner was struck with awe and converted to Christianity. Or, as Gildas put it, 'from a wolf became a lamb'.
It seems to me that, in Gildas's parlance, 'wolf' means Paganism and 'lamb' signifies Christianity.
With this symbolism in mind, it's quite easy to read what the saint is saying about Maelgwn here:
'...who of a wolf wast now become a lamb... out of the fold of our Lord, and made thee of a lamb, a wolf like unto himself, again?'
Maelgwn had been decidedly Pagan. He converted to Christianity, became a monk, then was converted back into Paganism. So there was the wolf, what about the eagle?
Gildas only referred to eagles on one other occasion. Also in his historical section, he had been describing attacks upon the British by Picts and Scotti. Suddenly he switched to a discussion of invaders from beyond the sea - which could possibly still be the Scotti, as they originated in Ireland. They would later over-run Alba renaming it Scotland. These were dismissed merely as 'wolves', who took plunder home, while leaving ruined lives, settlements and crops behind.
Envoys from Britain met with representatives from the recently departed Roman Empire. A legion was sent to help the British, supported by mariners and cavalry. It only happened once, but the Romans won the day. Their cavalry was 'like a flight of eagles'.
That's it. That's the mention. But the context is all wrong. Those eagles had 'compassion' and 'human nature'. Maelgwn's eagle is a monster and a castaway. No more clues in Gildas then.
Fortunately Welsh legend provides us with both an eagle and a wolf as castaways, and they were deposited just up the road.