Old High German  Mittilagart is mentioned in the 9th-century Old High German Muspilli (v. 54) meaning "the world" as opposed to the sea and the heavens: Sea is swallowed, flaming burn the heavens, Moon falls, Midgard burns  
Old High German and Old Saxon Mittilagart is mentioned in the 9th-century Old High German Muspilli (v. 54) meaning "the world" as opposed to the sea and the heavens: Sea is swallowed, flaming burn the heavens, Moon falls, Midgard burns Middilgard is also attested in the Old Saxon Heliand: Over the middle earth; and all men He could help
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and Old Saxon
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Middilgard is also attested in the Old Saxon Heliand:
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Over the middle earth; and all men He could help