"Eminem's father, Marshall Bruce Mathers II started dating Debbie (Eminem's mother) when she was 15. He was 22. They got married. The relationship turned sour."
"We should probably start calling Eminem by his rather regal sounding real name: Marshall Bruce Mathers III.
That's because he's apparently related to 9th century Welsh King, Rhodri Mawr (the Great).
Records on a US genealogy site suggest he's Marshall III's 33rd great-grandfather."