The word love goes back to the very roots of the English language. Old English lufu is related to Old Frisian luve, Old High German luba, Gothic lubo. There is a cognate lof in early forms of the Scandinavian languages. The Indo-European root is also behind Latinlubet meaning it is pleasing and lubido meaning desire. The word is recorded from the earliest English writings in the 8th century. 
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It was not discovered by someone it was originated by certain languages.
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