Mirgen

According to the Old English Dictionary:

mirgen

that which causes delight, poetry(?) :-- Him wæs lust micel ðæt hé ðiossum leódum leóþ spellode, monnum myrgen great his (Alfred) delight was lays to relate, matter of mirth for men, Bt. Met. Fox introd. 9; Met. Einl. 5. Cf. mirigness. mirgen