Who is Lydia (Lidian) Jackson Emerson from Emerson: The Mind on Fire: A Biography and what is their importance?

Lydia (Lidian) Jackson Emerson was Ralph Waldo's second wife. The couple shared a great intellectual and emotional bond. Lidian is described as a tender, passionate, clairvoyant, and often anxiety-ridden. The death of their first son, Waldo, was difficult for her. As Emerson aged, he began spending more time at home. In his presence, she grew healthier than she'd been in years and even began socializing.