Irmogate was a notorious scandal involving Nienna the vala and Olorin the maiar in the first age.
While Nienna, vala of grief, was teaching Olorin, she of poor fortune became enamoured of him. Olorin was cautious, but soon returned her devotion. When this was discovered by Manwe the Great, Olorin cloaked himself in grey and fled in shame. Nienna shed unnumbered tears, and Manwe took pity upon her, but did not allow it to continue.