Here are the possible solutions for matisse reportedly called him the father of us all clue
Answer
Clue
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cezanne
Clue
Matisse reportedly called him "the father of us all"
neko
Clue
Rocker Case who tweeted "If a dude called me a 'cougar' I'd be more likely to kill him bare-handed and shit him out in front of his parents than fuck him"
rubik
Clue
It reportedly took him a month to solve his own puzzle