Ha-ha, I found it! Thing is I was concetrating on books that we know more of, such as those written by Merry, but I realised that it's not really necessary to know what the books were exactly.
As such, the answer seems to be
Tar-Elendil (so that's why Elendil was so "warm"
), of whom the following is said in the UT, The Line of Elros: Kings of Númenor:
Quote:
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He was also called Parmaitë, for with his own hand he made many books and legends of the lore gathered by his grandfather.
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