1. Like most inflected languages, Mercian has a few irregular verbs (such as 'to be' bēon and 'have' habben).

2. The 7th century saw a struggle for hegemony between Northumbria and Mercia, which in the 8th century gave way to Mercian preeminence.

3. 119: Nor let the spacious Mound of that great Mercian King (Into a lesser roomth thy Burlinesse to bring) Include thee; References

4. A claim made in a ninth-century list of donations from the abbey of Gloucester that Æthelbald had "stabbed—or smitten" to death the kinsman of a Mercian abbess has also contributed negatively to his reputation.

5. Elf (n.) "one of a race of powerful supernatural beings in Germanic folklore," Old English elf (Mercian, Kentish), ælf (Northumbrian), ylfe (plural, West Saxon) "sprite, fairy, goblin, incubus," from Proto-Germanic *albiz (source also of Old Saxon alf, Old Norse alfr, German alp "evil spirit, goblin, incubus"), origin unknown; according to Watkins, possibly from PIE *Albho-"white."