Mark Twain 
A Letter from Santa Claus 

Mark Twain wrote this letter to his 3 year old daughter from Santa Claus in 1875. You could say he was over the moon for her:
‘My Dear Susy Clemens,
I have received and read all the letters which you and your little sister have written me . . . . I can read your and your baby sister's jagged and fantastic marks without any trouble at all. But I had trouble with those letters which you dictated through your mother and the nurses, for I am a foreigner and cannot read English writing well’. 

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Samuel Langhorne Clemens (November 30, 1835 – April 21, 1910),   known by his pen name Mark Twain, was an American writer, humorist, entrepreneur, publisher, and lecturer.