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Then who is Sanguinius?

Sanguinius---> also known as Papa Sang, Definitely Not Led Zeppelin's Robert Plant and Primarch Fabulous

here's the answer to your question: https://1d4chan.org/wiki/Sanguinius

I didn't ask a question.

you just did. "Then who is Sanguinius?" then I googled it and gave yo the answer. :)

What did I do?

I just realized... I'm talking to a bot. LOL! you're a genius @fyrstikken. I upvoted you as witness.