Codex Regius
Around the 13th century, Œ/Ǿ (, which had probably already lowered to ) merged to Æ (). Thus, pre-13th-century (with 'œ') 'green' became modern Icelandic (with 'æ'). The 12th-century Gray Goose Laws manuscripts distinguish the vowels, and so the Codex Regius copy does as well. However, the 13th-century Codex Regius copy of the Poetic Edda probably relied on newer and/or poorer quality sources. Demonstrating either difficulty with or total lack of natural distinction, the manuscripts show separation of the two phonemes in some places, but they frequently confuse the letters chosen to distinguish them in others.