Veteran BBC broadcaster Sir Terry Wogan has died aged 77, after a short illness, his family has confirmed.
In a statement, they said: "Sir Terry Wogan died today after a short but brave battle with cancer.
"He passed away surrounded by his family. While we understand he will be missed by many, the family ask that their privacy is respected at this time."
BBC director general Tony Hall said: "Terry truly was a national treasure."
Sir Terry leaves wife Lady Helen and their three children. The couple also had a daughter who died in infancy.
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Limerick-born Sir Terry had a 50-year career on television and radio, including presenting Wake up to Wogan on BBC Radio 2 and the Wogan chat show.
He was also the voice of Eurovision in the UK for many years and had been involved in the Children in Need appeal since it began.
BBC Radio 2 controller Bob Shennan said: "As the host of Wake up to Wogan, Terry established himself as one of the greatest and most popular radio hosts this country has ever heard.
"We were brightened by his wonderful personality and charm as he woke us up every weekday morning, becoming an essential and much-loved part of our lives.
"His millions of listeners adored him, as did his whole Radio 2 family. We will miss him enormously and our thoughts at this very sad time are with Helen and all the family."
Sir Terry originally went into banking after college before switching careers to join Ireland's national Radio Eireann as a newsreader and announcer.
He moved into light entertainment, as a DJ and host of TV quiz and variety shows in Ireland, before joining the BBC, where he would stay for the rest of his career.
He presented the breakfast show from 1972 to 1984, as The Terry Wogan Show, and then from 1993 to 2009 as Wake Up To Wogan.
He built up a firm fanbase, dubbing his audience the TOGs, or Terry's Old Geezers and Gals.
When he broadcast at breakfast for the final time, he told listeners: "The years together with you have not only been a pleasure but a privilege. You have allowed me to share your lives with you.
"When you tell me how important I have been in your lives it's very moving. You have been every bit as important in mine."
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