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.
Saint Sebastian a christian and martyr killed in 288 by being tied to a tree and shot with arrows. He was executed under Roman emperor Diocletian for betrayal. 
 
 Though never recorded to have been homosexual, Saint Sebastian became a homoerotic icon; perhaps due to the fact that he was extremely handsome and young. When Wilde was in exile in France, he wrote under the pseudonym Sebastian Melmoth as a tribute to Saint Sebastian.
The Grave of Keats