Monsanto Monsanto The Monsanto Company () was an American agrochemical and agricultural biotechnology corporation that existed from 1901 until 2018 when it was acquired by Bayer. It was headquartered in Creve Coeur, Missouri. Monsanto developed Roundup, a glyphosate-based herbicide in the 1970s, and became a major producer of genetically engineered crops. Monsanto was one of four groups to introduce genes into plants (1983), and was among the first to conduct field trials of genetically modified crops, (1987). It was one of the top 10 U.S. chemical companies until it divested most of its chemical businesses between 1997 and 2002, through a
Castle of Monsanto an unknown commander. As a result of this change, in 1174, a new foral was issued to the inhabitants of Monsanto, by D. Afonso Henriques, which was confirmed in 1190 by D. Sancho I. A contemporary castle was constructed during the 13th century. It was reconstructed in the 14th century, during the reigns of King D. Dinis and D. Fernando. But, following its alignment with the Kingdom of Castile during the 1383–1385 Portuguese interregnum, the site began to fall into disorder. According to the chronicler Fernão Lopes, Monsanto was a village that had been loyal to Queen Beatrice. But, later