Rid of the world's injustice, and his pain,
He rests at last beneath God's veil of blue;
Taken from life when life and love were new
The youngest of the martyrs here is lain,
Fair as Sebastian, and as early slain.
No cypress shades his grave, no funeral yew,
But gentle violets weeping with the dew
Weave on his bones an ever-blossoming chain.
O proudest heart that broke for misery!
O sweetest lips since those of Mitylene!
O poet-painter of our English Land!
Thy name was writ in water—it shall stand;
And tears like mine will keep thy memory green,
Mitylene could be referring to either the city, or the character from Greek Mythology. Mitylene was an Amazon, and the sister of Myrina. The city was named in her honour, and in it inhabited some of the greatest minds in Greek history; including Aristotle, Alcaeus, and Sappho. Though the city was never mentioned in Keats' poems, Wilde himself had a strong passion for Greek Mythology and Greece’s great poets and philosophers. 

The Grave of Keats