The term 'Irish Hero' can be summarized by two crossword solutions: Ossian (6 letters) and EMMET (5 letters). Ossian is a legendary Gaelic warrior-poet from the 3rd century, whose stories were popularized in the 18th century by Scottish poet James Macpherson. EMMET was an Irish nationalist who led a failed rebellion against British rule in 1803. He was executed for his role in the uprising, and is remembered as a martyr of Irish independence.