What is "yonec"

"Yonec" is one of the Lais of Marie de France, written in the twelfth century by the French poet known only as Marie de France. Yonec is a Breton lai, a type of narrative poem. The poem is written in the Anglo-Norman dialect of Old French in rhyming couplets of eight syllables each. This lai tells the story of a woman who seeks to escape a loveless marriage, and of the child born from the love that she found elsewhere.