Why does dante refer to minos and other allusions from mythology

Typical of the monsters and guardians of hell, Dante's Minos is an amalgam of figures from classical sources who is completed with a couple of the poet's personal touches. His Minos may in fact be a combination of two figures of this name--both rulers of Crete--one the grandfather of the other. The older Minos, son of Zeus and Europa, was known--because of his wisdom and the admired laws of his kingdom-- as the "favorite of the gods." This reputation earned him the office-- following his death--of supreme judge of the underworld. He was thus charged, as Virgil attests, with verifying that the personal accounting of each soul who came before him corresponded with what was written in the urn containing all human destinies: "He shakes the urn and calls on the assembly of the silent, to learn the lives of men and their misdeeds" (Aen. 6.432-3). The second Minos, grandson of the first, exacted harsh revenge on the Athenians (who had killed his son Androgeos) by demanding an annual tribute of fourteen youths (seven boys and seven girls) as a sacrificial offer to the Minotaur, the hybrid monster lurking in the labyrinth built by Daedalus. 
 
Minos' long tail, which he wraps around his body a number of times equal to the soul's assigned level (circle) of hell (Inf. 5.11-12), is Dante's invention. How do you think the judged souls travel to their destined location in hell for eternal punishment? Might Minos' tail be somehow involved in this unexplained event? Dante leaves this detail to our imagination. 
 
The original Italian of the first line describing Minos --"Stavvi Minòs orribilmente, e ringhia" (Inf.5.4)--is a wonderful example of onomatopoeia (the sound of the words imitating their meaning) as the repeated trilling of the r's in "orribilmente e ringhia" evokes the frightening sound of a growling beast. 

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