:::::::Sarbajit, there is another book by the same Samaren Roy where this aspect (Tagore's  Pirali caste) is explored in great detail - unlike his 300 years of Calcutta book p.88. This is "Bengalees-Glimpses of History and Culture" published 1999 ISBN:8170239818. At page 55 " ... though the evidence was wholly circumstantial. The allegation was a means to secure the social boycott of the Tagores who worked for a Muslim potentate. ... on such a flimsy allegation". There is also the 1896 source which refutes all these allegations - J.N.Bhattacharya (1896, pg.123) who identifies the "leading Brahmin personage who formed a party for degrading the Tagores" ... "but the Tagores were not to be denied but continued to grew in prosperity, fame and numbers". Bikash 69.50.160.154