Eirian Llwyd was born at Prion near Denbigh. She qualified as a nurse in Liverpool in 1969-73 and then worked as a midwife at St Asaph Hospital.
She married Ieuan Wyn Jones in 1974 and was said to have been a like a rock to her husband as his political career took off.
Ms Llwyd died last night at Ysbyty Gwynedd hospital in Bangor, North Wales.
She is survived by husband Ieuan, 64, her three children Gerallt, Gwenllian and Owain, and six grandchildren.
Plaid Cymru has announced that the artist Eirian Llwyd, who was married to the party's former leader Ieuan Wyn Jones, has died. She was 63 and had been ill for a short time. The couple had two sons and a daughter.
Former First Minister Rhodri Morgan and the former Deputy First Minister Ieuan Wyn Jones have been reunited - in the House of Lords. They were giving evidence to the Lords' Constitution Committee which is looking into the experience of coalition government.
Labour and Plaid Cymru formed a coalition government after the Welsh election of 2007. They were asked by peers how they'd found the experience and how that could translate to possible future coalitions in Westminster.
Labour's Rhodri Morgan told the committee that he found it 'odd' that UK Labour leaders hadn't approached him for advice when trying to form a coalition in 2010. If they had, he said he'd have told them Gordon Brown would have to have stepped down as leader.
Meanwhile the former Plaid Cymru leader highlighted the important role of civil servants during negotiations. He said they enabled him to know which of Plaid's policies were deliverable which helped when they merged the two parties' manifestos into a single programme.
Both men revealed they'd kept out of detailed negotiations in 2007. Ieuan Wyn Jones said they'd met at the beginning of talks and then rarely over the subsequent month. Rhodri Morgan said that it was important to appoint 'natural negotiators' to shape a full coalition deal.
The former Plaid Cymru leader Ieuan Wyn Jones has told his party's conference in Beaumaris that his successor, Leanne Wood, can become First Minister in 2016. He said Plaid must be seen as the party that fights for jobs and for the life of Welsh communities, to win the next Assembly election.
He added that he became MP for Ynys Mon in 1987, two years after the last time Plaid Cymru held its conference on Anglesey. He said now they have two months to win the leadership of the island's county council. Elections were postponed from last year because of problems with feuding councillors.
Mr Jones claimed Anglesey needs Plaid Cymru to offer clear policies and leadership to give people a council they can respect. He was followed by Ceredigion AM Elin Jones who said Plaid in Anglesey can follow the example of her constituency, where the party gained the council leadership last year.
Ieuan Wyn Jones AM for Ynys Môn has described the news that 350 jobs are at risk on Anglesey as a "massive blow" to the local workforce and the island's economy.
The former leader of Plaid Cymru says he will be raising the issue with the Deputy Minister for Agriculture Alun Davies AM in the Assembly early next week.
Plaid Cymru has called for a new Government of Wales Act to avoid 'wasteful' arguments in the Supreme Court over what powers the Assembly has. It follows decisions by the Attorney General to refer to the court the first two Welsh bills since last year's referendum.
Former leader Ieuan Wyn Jones says a new Act should set out what the Assembly is NOT responsible for, rather than what powers it has. And he pointed to last week's ITV Wales poll as proof that most people here want the Welsh Government and Assembly to have a greater say over the way Wales is run.
Mr Jones said
Former Plaid Cymru leader Ieuan Wyn Jones has refused to add to the party's statement regarding Bethan Jenkins' drink-driving arrest. Speaking at Plaid's weekly press briefing Mr Jones said,
Internal party procedures would be distinct from any Assembly action and separate of course to the police investigation into the case. When I asked Mr Jones to say more about what those party procedures involve, he would involve he would only say that,
Plaid Cymru has issued its response to proposals to change the way Assembly Members are elected which have been published by the Welsh Secretary Cheryl Gillan today.