Old Norse form of Glathsheim; in Norse mythology, the blessed realm where righteous souls dwell after death.
Old Norse 'Glaðheimr' from 'glað' (glad, smooth) plus 'heimr' (home, realm). The '-r' is the Norse nominative case ending.
The Old Norse spelling 'Glathsheimr' shows us how Norse used grammatical case endings that English completely lost—that little '-r' at the end tells you it's the subject of a sentence!
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