Between 1568 and 1574 there is a record of six English missions to Baku. English men named Thomas Bannister and Jeffrey Duckett described Baku in their correspondence. They wrote that the "...town is a strange thing to behold, for there issueth out of the ground a marvelous quantity of oil, which serveth all the country to burn in their houses. This oil is black and is called "nefte". There is also by the town of Baku, another kind of oil which is white and very precious, and it is called petroleum".