Former prime minister Baroness Thatcher dies peacefully at the age of 87 after suffering a massive stroke. Known as the Iron Lady, she became Britain's first and only female Prime Minister Baroness Thatcher had suffered from poor health over the past decade Tory politician will have state funeral with military honours at St Paul's Cathedral - first since Winston Churchill David Cameron: 'We've lost a great leader and a great Briton' Queen 'sad' about death and sends private message of sympathy to her family Former Conservative Prime Minister Margaret Thatcher has died of a stroke today aged 87. Britain's first and only female political leader passed away peacefully after a long battle with poor health. Her spokesman Lord Bell said: 'It is with great sadness that Mark and Carol Thatcher announced that their mother Baroness Thatcher died peacefully following a stroke this morning'. The Queen was sad to hear of Baroness Thatcher's death and Her Majesty will send a private message of sympathy to the family, Buckingham Palace said today. Prime Minister David Cameron said: 'It was with great sadness that l learned of Lady Thatcherâ€™s death. We've lost a great leader, a great Prime Minister and a great Briton'. He will return early from his visit to Europe this afternoon following the death of Baroness Thatcher, Downing Street said. The grocer's daughter, who became the longest serving British prime minister of the 20th century, will be honoured with a full state funeral at St Paul's Cathedral. Not since Winston Churchill's death has a politician been granted such a tribute. His funeral was also held there in 1965. 'A wide and diverse range of people and groups with connections to Lady Thatcher will be invited,' Number 10 said. 'The service will be followed by a private cremation. All the arrangements being put in place are in line with wishes of Lady Thatcher's family. Further details will be published over the coming days.'