 In 1496, after disagreements regarding new regulations for the tin-mining industry, the king, working partly through the Duchy of Cornwall, suspended the operation and privileges of the Cornish stannaries, a major part of the economy of the county.The privileges, which included exemption from certain royal and local taxes, had been granted under a deal with Edward I in 1305.Being threatened in 1496-7 with invasion by the Scottish king and the pretender Perkin Warbeck, Henry VII levied an extraordinary series of financial demands on his subjects