The Wild Swans at Coole is a poem by William Butler Yeats, written in 1917. It is a reflection on the passage of time and the inevitability of change. The poem is set in the autumn at Coole Park, a country estate in Ireland owned by Lady Gregory,
From Wikipedia
"The Wild Swans at Coole" is a lyric poem by the Irish poet William Butler Yeats (1865–1939). Written between 1916 and early 1917, the poem was first published in the June 1917 issue of the Little Review, and became the title poem in the Yeats's 1917 and 1919 collections The Wild Swans at Coole.