We've gone behind the scenes as Game of Thrones star Aidan Gillen prepares for his role as Irish comedy great Dave Allen in the new biopic Dave Allen at Peace, which airs on RTÉ One on Easter Monday at 9:30pm.

The eagerly-awaited drama explores "how Dave's comedy genius was shaped by the tragic loss of his father, his brother… and his finger. 

Aidan Gillen between takes with director Andy De Emmony

"How he survived decades of the Roman Catholic Church's wrath, death threats from the IRA and a ban by Irish and Australian TV, only to have his television career end in controversy when he used the f-word in an innocuous joke."

The hour-long film sees Tommy Tiernan play Allen's father, Cully, with Gillen's Game of Thrones co-star Conleth Hill playing Allen's brother, John.

Tommy Tiernan as Dave Allen's father, Cully

The cast also includes Line of Duty's Joanne Crawford as Allen's mother Jean, Game of Thrones' Ian McElhinney and Pauline McLynn.

Commissioned by the BBC in association with RTÉ, Dave Allen at Peace was written by Stephen Russell, whose credits include We're Doomed: The Dad's Army Story and Peaky Blinders. It is directed by Father Ted and Quacks director Andy De Emmony.

Aidan Gillen as Dave Allen with his Game of Thrones co-star Conleth Hill as Allen's brother, John

Initially following his father, former Irish Times editor Cully Tynan O'Mahony, into journalism, Allen later became a Butlins Redcoat and then embarked on his trailblazing comedy career.  

Best known for his hit shows Tonight with Dave Allen and Dave Allen at Large, Allen - born David Tynan O'Mahony - became a household name in Ireland and the UK in the 1970s and is considered to be one of the godfathers of modern stand-up.

Dave Allen is considered to be one of the godfathers of modern stand-up

He died in his sleep at his West London home in March 2005 at the age of 68.

Here's a preview clip from Dave Allen at Peace - Easter Monday, April 2, RTÉ One, 9:30pm and BBC Two at 9:00pm.