“Come! let the burial rite be read — the funeral song be sung! —
An anthem for the queenliest dead that ever died so young —
A dirge for her the doubly dead in that she died so young.”

Dum vivimus vigilamus, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

Act IV, scene ii.
Duchess of Malfi (1623)
Source: The Duchess of Malfi

Source: The Small House at Allington (1864), Ch. 3

Source: A Grief Observed (1961), Ch. 1

Memorial Day Vision. Reported in Bartlett's Familiar Quotations, 10th ed. (1919).
Attributed
Context: These heroes are dead. They died for liberty — they died for us. They are at rest. They sleep in the land they made free, under the flag they rendered stainless, under the solemn pines, the sad hemlocks, the tearful willows, the embracing vines. They sleep beneath the shadows of the clouds, careless alike of sunshine or storm, each in the windowless palace of rest. Earth may run red with other wars — they are at peace. In the midst of battles, in the roar of conflict, they found the serenity of death.

The Horses of Achilles http://www.cavafy.com/poems/content.asp?id=134&cat=1
Collected Poems (1992)
Context: When they saw Patroklos dead
— so brave and strong, so young —
the horses of Achilles began to weep;
their immortal nature was upset deeply
by this work of death they had to look at.

III, st. 3.
The Fall of the Leaves (1874)

Song The Young Ones