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from Latin nātālītius (from nātālis natal (adj.) presiding over birthdays or nativities) + -ous
1646 - The History of the Life and Reign of Richard the Third, Sir George Buck a 1623 (1646);
see Example below
From: A Complete History of England:
With the Lives of All the Kings and Queens Thereof.
Volume I, 1706
The Life and Reign of Richard the Third, By George Buck.
Book III. The Argument of the Third Book of the Life and Reign of Richard the Third