Mongán mac Fíachna Lurgan ab Artur filio Bicoir Pretene lapide percussus interit, unde dictum est--Bec Boirche  dixit:
Ocus in dias ele 
dia fognad mór de thúathaib:
Mongán mac Fiachnai Lurgan,
ocus Rónán mac Túatheil.'
From the Annals of Clonmacnois.
Quoted by O’Donovan, FM. vol. i. p. 243, note z.
A.D. 624. Mangan mac Fiaghna, a very well-spoken man, and much given to the wooing of women, was killed by one ??? [Arthur ap] Bicoir, a Welshman, with a stone.