Dr. Guillermo Rawson (24 June 1821 - 20 January 1890) was a medical doctor and politician in nineteenth-century Argentina. As Interior Minister in 1862 he met Captain Love Jones-Parry and Lewis Jones who were on their way to Patagonia to investigate whether it was suitable for the creation of a Welsh settlement there. Rawson came to an agreement with them, and this resulted in the creation of a colony in the Chubut Valley in the following years. The city of Rawson, the capital of the province of Chubut was named after him.
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