This year's trio brings to 15 the number of women awarded the Nobel Peace Prize. The laureates are advocates against war and for the environment and the rights of women, children and the poor.
2011: President Ellen Johnson Sirleaf, Liberia (with Karman and Gbowee). Sirleaf rose to international prominence in 2005 when she became Africa’s first elected female leader. (AP)
2011: Leymah Gbowee, Liberia (with Sirleaf and Karman). Gbowee is honored for bringing together thousands of women to help end war. (AP)
2011: Tawakkul Karman, Yemen (with Sirleaf and Gbowee). Karman is a leading "Arab Spring" activist in her country. (AP)
2004: Wangari Maathai, Kenya. She developed the Green Belt Movement for women in Africa to conserve the environment and improve their lives by planting trees. (AP)