The Pursuit of Diarmuid and Gráinne (Irish: Tóraigheacht Dhiarmada agus Ghráinne or Tóraíocht Dhiarmada agus Gráinne in modern spelling) is an Irish prose narrative surviving in many variants. A tale from the Fenian Cycle of Irish mythology, it concerns a love triangle between the great warrior Fionn mac Cumhaill, the beautiful princess Gráinne, and her paramour Diarmuid Ua Duibhne. Surviving texts are all in Modern Irish and the earliest dates to the 16th century, but some elements of the material date as far back as the 10th century.