Two poems about the loss of a best friend are John Milton's "Lycidas" and Alfred Lord Tennyson's "In Memoriam." Both poems deal with the consequences of the loss of a close friend and the sense of sorrow and regret that results from such an event.
Tennyson wrote "In Memoriam" after the death of a very close friend who was also his sister's fiancé. It is a very long poem that deals with, among other things, the loss of hope after such a drastic blow. Milton's poem is about a shepherd whose close friend Lycidas has drowned. The young shepherd expresses rage that such a young life has gone to waste and seeks to know who is the architect of such a fate.