I have been in a multitude of shapes,
Before I assumed a consistent form.
I have been a sword, narrow, variegated,
I will believe when it is apparent.
I have been a tear in the air,
I have been the dullest of stars.
I have been a word among letters,
I have been a book in the origin.
I have been the light of lanterns,
A year and a half.
I have been a continuing bridge,
Over three score river mouths.

Book of Taliesin (c. 1275?) - The Battle of the Trees