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<img loading="lazy" src="https://cdn.kahimyang.com/resources-4/rosales-macapagal-sm.webp" alt="Cosoy Rosales and Macapagal" />
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(Senator Rosales (far right) delivering a speech at an event attended by President Macapagal and the First Lady. 
 Date and event not known.)
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Decoroso popularly known as "Cosoy", earned his Associate of Arts in 1920 and Bachelor of Laws from the University of the Philippines. He was admitted to the Bar on February 4, 1933. 
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Not known to many, Rosales, not only served the people of Samar and Leyte but also the people of Cebu during the World War II, having been assigned in the Civil Affairs of the Cebu Area Command headed by Colonel James N. Cushing.  Rosales also assisted Cebu Governor Hilario Abellana in setting up the civilian government in the areas not yet occupied by the Japanese Imperial Army. 
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He rose to the rank of colonel at the end of the war.
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His entry into politics was running against Jose Avelino in the 1941 congressional elections.  Avelino was at that time was the Secretary of Public Works and political kingpin of Samar.  Rosales won but was unable to assume office as World War II broke out in the Pacific, when the Japanese Imperial Army bombed Pearl Harbor on December 8, 1941.
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Jose Avelino would later become a senator who would run as president in 1949 but lost to Elpidio Quirino.
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In 1947, Rosales run for governor of Samar province (then comprising of the entire Samar island) after the war running under the ticket of Sergio Osmeña. The glamour of the Roxas' bandwagon and the illusions it created in the minds of the newly-liberated Philippines proved too much for the aging Osmeña.  Along with the rest of the Osmeña ticket, Rosales lost his bid to Baltazar Avelino. </p>
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In 1951 Rosales again run for governor, this time he defeated Avelino. He was then elected chairman of the League of Governors and the City Mayors of the Philippines in 1953. 
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December 20, 1907, Decoroso Rosales was born in Calbago, Calbayog, Samar