Vivian

Vivian was a human female and the mother of Thassarian and Leryssa. She and her children lived alone on a farm because her husband, Killoren, had died and was said to be a hero. When Thassarian was ordered to join Prince Arthas' army, Vivian was saddened but after all she gave him an amulet which belonged to his father as a blessing.

Arthas Menethil forced Thassarian to kill her after becoming a death knight during the fall of Capital City in the Third War. He obeyed and tossed the amulet he got from her. Right after this, the amulet was found by William Allerton, and it presumably ended in the hands of Leryssa.

Speculation
During the death knight class hall mission Fallen Steeds: The Baron's Saddle, champions are sent to collect the saddle of Deathcharger from Stratholme. An enemy during the mission is called Vivian's Lament. Due to the theme of the mission and it happening in Lordaeron, the enemy may be the ghost of Vivian.