The tortoise had been the pet of Robert Clive, the famous British military officer in colonial India around the middle of the 18th century, a local minister in West Bengal state said.

Local authorities say the tortoise, named "Addwaitya" meaning the "The One and Only" in Bengali, was the oldest tortoise in the world but they have not presented scientific proof to back up their claim.

"Historical records show he was a pet of British general Robert Clive of the East India Company and had spent several years in his sprawling estate before he was brought to the zoo about 130 years ago," West Bengal Forest Minister Jogesh Barman said.

"We have documents to prove that he was more than 150 years old, but we have pieced together other evidence like statements from authentic sources and it seems that he is more than 250 years old," he said.

The minister said details about Addwaitya's early life showed that British sailors had brought him from the Seychelles islands and presented him to Clive, who was rising fast in the East India Company's military hierarchy.