Penn Treaty Museum

On June 23, 1683, William Penn signed a friendship treaty with the Lenni Lenape (Delaware) Indians in Pennsylvania. According to Voltaire, it is the only treaty "not sworn to, nor broken". An excerpt from the article:

"Other historians place the date of the treaty on June 23, 1683, when Penn purchased two tracts of land from Tamanend and his associates, with the assumption that the transaction and the Great Treaty took place at the same time and place. Some study West's painting of the treaty scene and note the trees have full foliage and thus not suggesting a late autumn or winter day, as contended by Bancroft, but rather a day in the leafy month of June. Even if the purchase of the two tracts of land from Tamanend and others" on the 23rd of June, 1683, as being the impetus for the Great Treaty, it was most certainly a treaty of great importance and entitled to a prominent place in the Indian history of Pennsylvania and the Nation."