Freemasons are members of an international fraternal and charitable organization known for secret rites and signs. They use builders' tools as symbols to teach basic moral truths and promote the brotherhood of man. According to their history, Freemasonry began during the construction of King Solomon's Temple, with stonemasons organized into grades and classes. However, Freemasonry is widely considered to have been formally established in 1717 with the first Masonic lodge in London.