The son of a beloved FDNY hero who rescued a fallen straphanger from the tracks — before dying on 9/11 trying to save his comrades — was among more than 100 Bravest to be promoted Tuesday.

Frederick J. Ill the Third landed the new rank of captain for Queen’s Rescue 4, making him the same rank as his courageous namesake father when he died in the terror attacks almost exactly 24 years ago.

“I am a legacy,” Ill, 46, told The Post after accepting his new title. “My father was Captain Frederick J. Ill, the junior, and he was in Ladder Company 2 on 911, so to carry his name, very special.” 5

Ill’s father was 49 years old when he bravely charged into the burning Twin Towers on Sept. 11, 2001 — but he was already a hero in the FDNY.

Frederick J. Ill Jr. was lauded in 1999 after he le

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