Former First Lady Rosalynn Carter died Sunday at 2:10 p.m. at her home in Plains, Georgia, at the age of 96.

She died peacefully, with family by her side, according to a statement from the Carter Center.

Carter was married for 77 years to Jimmy Carter, the 39th president of the United States and the 2002 Nobel Peace Prize recipient, who is now 99 years old.

On Friday, the Carter Center said that Rosalynn Carter, 96, had entered home hospice care. President Carter, 99, went into home hospice in February. The couple has lived in the same ranch house they have lived in since 1961, save their years in the Georgia governor’s mansion and the White House.

“Rosalynn was my equal partner in everything I ever accomplished,” Jimmy Carter said, according to the statement from the center. “She gave me wise guidance and encouragement when I needed it. As long as Rosalynn was in the world, I always knew somebody loved and supported me.”

Unlike many previous first ladies, Rosalynn sat in on Cabinet meetings, spoke out on controversial issues and represented her husband on foreign trips. Aides to President Carter sometimes referred to her — privately — as “co-president.”

Throughout her husband’s political career, she chose mental health and problems of the elderly as her signature policy emphasis, according to The Associated Press. When the news media didn’t cover those efforts as much as she believed was warranted, she criticized reporters for writing only about “sexy subjects.”

As honorary chairwoman of the President’s Commission on Mental Health, she once testified before a Senate subcommittee, becoming the first first lady since Eleanor Roosevelt to address a congressional panel. She was back in Washington in 2007 to push Congress for improved mental health coverage, saying, “We’ve been working on this for so long, it finally seems to be in reach.”

She is survived by her children — Jack, Chip, Jeff, and Amy — and 11 grandchildren and 14 great-grandchildren. A grandson died in 2015.

“Besides being a loving mother and extraordinary First Lady, my mother was a great humanitarian in her own right,” said Chip Carter. “Her life of service and compassion was an example for all Americans. She will be sorely missed not only by our family but by the many people who have better mental health care and access to resources for caregiving today.”

The schedule of memorial events and funeral ceremonies is forthcoming.