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Bishweshwar Prasad Koirala, Manisha Koirala's grandfather, was a prominent Nepali politician and writer. He served as the Prime Minister of Nepal twice, from 1959 to 1960 and from 1991 to 1994. Koirala was a key figure in the Nepali Congress Party and played a significant role in the country's struggle for democracy. He was also a renowned author, known for his novels and political writings.