António de Serpa Pimentel (1825 in Coimbra – 1900) was Prime Minister of Portugal from 14 January to 11 October 1890. His term in office began as a reaction to the British ultimatum concerning Portuguese colonial policy in southeast Africa. The signing of the Anglo-Portuguese Treaty later that year, which was intended as a step to resolve the crisis, was viewed as further appeasement of a powerful Britain. This led to his resignation and the fall of his government.
Extract the beginning and ending term of António de Serpa Pimentel from the following text
António de Serpa Pimentel was the Prime Minister of Portugal from 14 January 1890 to 11 October 1890