Mother's Day is a commemoration honoring the mother of all families, as well as motherhood, maternal bonds, and the influence of mothers in society. Over the world it is celebrated on different days, most commonly in the months of March or May. It complements similar celebrations honoring family members, such as Father's Day, Siblings Day, and Grandparent's Day.
Mother's Day (10 May): Annual Celebration
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The modern Mother's Day began in the United States, at the initiative of Anna Jarvis in the early 20th century. This is not (directly) related to the many traditional celebrations of mothers and motherhood that have existed throughout the world over thousands of years, such as the Greek cult to Cybele, Rhea the Great Mother of the Gods, the Roman festival of Hilaria, or the Christian Mothering Sunday celebration (originally a commemoration of Mother Church, not motherhood). However, in some countries, Mother's Day is still synonymous with these older traditions.
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The modern holiday of Mother's Day was first celebrated in 1908, when Anna Jarvis held a memorial for her mother at St Andrew's Methodist Church in Grafton, West Virginia. St Andrew's Methodist Church now holds the International Mother's Day Shrine. Her campaign to make Mother's Day a recognized holiday in the United States began in 1905, the year her mother, Ann Reeves Jarvis, died. Ann Jarvis had been a peace activist who cared for wounded soldiers on both sides of the American Civil War, and created Mother's Day Work Clubs to address public health issues. Anna Jarvis wanted to honor her mother by continuing the work she started and to set aside a day to honor all mothers because she believed a mother is "the person who has done more for you than anyone in the world".
Source: en.wikipedia.org