1960 - Three sisters, Patria, Minerva and María Teresa Mirabal, were brutally murdered for their political activism. The sisters, known as the "Unforgettable Butterflies," became a symbol of violence against women in Latin America.
Women's activists have marked November 25 as a day against violence since 1981 and on December 17, 1999, the United Nations General Assembly designated November 25 (the anniversary of the day of the murder of the Mirabal sisters) as the annual date for the International Day for the Elimination of Violence Against Women in commemoration of the sisters. Due to their mark in history November 25, is observed each year as the International Day for the Elimination of Violence against Women in honor of the Mirabal sisters. It also marks the beginning of the 16 days of Activism against Gender Violence. The end of the 16 Days is December 10, International Human Rights Day.