Konkani used by Saraswats are Goan Konkani, Maharashtrian Konkani and Canarese Konkani. Historian Sanjay Subrahmanyam states that Saraswats at "Basrur on the Kanara coast south of Goa" were a "caste of open status", which sometimes claimed to be Brahmins although they were associated with mercantile activity and called as "Chatins" from Chetti by the Portuguese. Moroccan explorer Ibn Battuta had also visited Basrur, which was considered "the great center of Saraswat trade", two centuries earlier than the Portuguese, but it did not interest him as much as it did the Portuguese.Chatins de Barcelor was the term used for the Saraswat community of merchants at Basrur in the time of Diogo do Couto, but the term Chatin acquired a pejorative meaning later. It is likely derived from the Tamil 'Chati', which is a suffix for many trading castes that were present on the southern side of the Godavari river. The Saraswats and Gujarati Vanias in Goa, were involved not only in trade but also in tax related income. After the 1540s discrimination against non-Christians in Goa increased and there were mass conversions to Christianity. Despite this, between 1600 and 1670, about 80% of the tax farms or rendas were held by the Hindus, especially Saraswats. The prominent Saraswat merchants mentioned at this time i.e. early 1600s are Govinda, Pondya as well as the Kini and Nayaks. The rendas were on various items such as spices(pepper), cotton and silk cloths, food shops and duties on gold. Michael Pearson has given an example of members and relatives of a Saraswat Naik family to show that when a person successfully did a bidding for a renda from the government, he had to name some guarantors - who were usually his relatives or caste members. The Saraswats also traded at the Vengurla and Raybag ports and acted as suppliers of rice and pepper that they imported from Kanara. In this context, they also dealt with the Dutch who has established a factory in the port of Vengurla. Scholars mention a certain P.Nayak who was a notable merchant in the 1670s. Saraswat merchant families during the Portuguese rule of Goa also were involved in trade with Portuguese colonies around the globe including in the African slave trade. In the 19th century also, French slave merchants came to Goa and contacted the Portuguese and Saraswat Brahmins who sold them African slaves. In Konkan, the Saraswat as well