Loi Estrada

Luisa "Loi" Pimentel Ejercito Estrada (born June 2, 1930 in Iba, Zambales) is the wife of former Philippine President Joseph Estrada, and was the thirteenth First Lady of the Philippines from 1998 to 2001. In 2001, she ran as a candidate of the opposition for a seat in the Senate. She won, and served in the 12th and the current 13th Congress of the Philippines, making her the first First Lady to win a seat in the Senate. Her son, Jinggoy Ejercito Estrada is also a Senator serving with her in the Upper Chamber. She is a psychiatrist by profession, known as very close to the poor. She was dubbed as "First Lady ng Masa" (First Lady of the Masses) because of her medical and outreach missions during her term.

She earned her medicine degree at the University of Santo Tomas (UST), afterwhich she worked as a Professor in the UST Faculty of Medicine and Surgery, and a Physician at the UST Hospital and the National Center for Mental Health.