THE former SNP leader Gordon Wilson has died after a short illness, aged 79.

Wilson led the party from 1979 to 1990 and was MP for Dundee East from 1974 to 1987.

He passed away in hospital this morning.

The First Minister led tributes to the late politician and former solicitor who has been credited with building the SNP into a major political force.

"Gordon Wilson's contribution to the success of the modern SNP was immense and his loss will be keenly felt across our party. He was a fine and kind man, a loving husband, father and grandfather and a true patriot," she said.

"From his early days promoting the case for independence on Radio Free Scotland to his 13 years of service as MP for Dundee East and 11 years as leader of the party Gordon was a passionate advocate for Scotland at every level.

"He was at the centre of many lively and passionate debates through the 1970s and 80s over how independence would be achieved and continued to play a part in the independence debate right though the referendum in 2014."

She added: "Gordon was always forthright in his views and his commitment to seeing Scotland become an independent country was second to none. Even - perhaps especially - on those occasions when his views on tactics differed from mine, I always highly valued and appreciated his advice.

"My thoughts are with Edith and all of his family at this time. Gordon will be fondly remembered and sadly missed by all those who knew and worked with him in the SNP and across the country."

The former First Minister Alex Salmond, who succeeded Gordon Wilson as leader in 1990, added: "Not only was Gordon one of the masterminds of the SNP parliamentary breakthrough of the 1970s but he led the party through tough times in the 1980s. Holding his Dundee seat in 1979 and 1983 was crucial in retaining the credibility which allowed the SNP to prosper in the 1990s and beyond. The party, the national movement and Scotland owe him a great debt and my condolences go to Edith and the family."

Deputy First Minister and family friend John Swinney said: "Gordon Wilson was a giant of the Scottish National Party. He was critical to the transformation of the SNP from the fringe to the mainstream of Scottish politics. His administrative, campaigning and political skills built the SNP into a nationwide political force. The strength of the SNP today is built on the courage and tenacity of fine people like Gordon Wilson."

Wilson was born in Glasgow, the son of Elizabeth Murray and Robert George Wilson, a butcher's' van driver.

He went on to University of Edinburgh, where he graduated with a Bachelor of Laws degree. Following graduation, he qualified as a solicitor, and worked for T.F. Reid Solicitors in Paisley from 1963 until his election as an MP in February 1974.

He had joined the SNP in the late 1950s, later co-founder a political pirate radio station Radio Free Scotland, whose activities are described in his book, Pirates of the Air.

Wilson held a number of senior positions in the party before becoming a MP including Assistant National Secretary of the SNP from 1963 to 1964, and National Secretary from 1964 to 1971.

He was vice-chairman of the SNP Oil Campaign Committee, which was responsible for the party's iconic It's Scotland's oil campaign. It was Wilson who coined the slogan.

He is survived by his wife Edith, daughters Margaret and Katie, and five grandchildren.

In a statement, the SNP asked for the privacy of Wilson's family to be respected in the coming days.

It added that details would be announced later regarding funeral arrangements.