Actor Colin Farrell has pledged his support for same-sex marriage and urged his fellow Irish to do the same, People reports.

Farrell penned a letter in his column for UK's Sunday World, in which he detailed the hardships his gay brother Eamon had to go through because of his sexuality.

"My brother Eamon didn't choose to be gay. Yes, he chose to wear eyeliner to school and that probably wasn't the most pragmatic response to the daily torture he experience at the hands of bullies," the Irish actor wrote.

The "True Detective" actor also recalled how strong his brother was despite being bullied. "He was always proud of who he was," he added. "Proud and defiant and, of course, provocative. Even when others were casting him out with fists and ridicule and the laughter of pure loathsome derision, he maintained an integrity and dignity that flew in the face of the cruelty that befell him."

He then moved on to mentioning how his brother had to fly to Canada just to get married, saying: "The fact that my brother had to leave Ireland to have his dream of being married become real is insane. INSANE."

Farrell served as the best man during his brother and Steven Mannion's wedding in 2009, according to Radar.

The actor has been very supportive of his brother's and other members of the gay community's plights. In 2012, the Farrell brothers joined forces in supporting Stand Up! Don't Stand for Homophobic Bullying, according to Advocate. The campaign was launched by Irish LGBT group BeLonGTo and aimed to put an end to gay bullying in Ireland.

"In effect, bullying is no less than the systematic doling out of pain upon the innocent," the actor said at the time. "It is literally laughing in the face of somebody as they fall into increasingly grave danger. It's not my place to draw parallels, but we have had enough of such hardships. The world has."