Afterwards, Penn journeyed up the river and founded Philadelphia with a core group of accompanying Quakers and others seeking religious freedom on lands he purchased from the local chieftains of the Lenape or Delaware nation. This began a long period of peaceful co-operation between the colony and the Delaware, in contrast to the frictions between the tribe and the Swedish and Dutch colonists. However, the new colonists would not enjoy such easy relations with the rival and territorial Conestoga peoples to the west for a number of decades as the English Quaker and German Anabaptist, Lutheran and Moravian settlers attracted to the religiously tolerant colony worked their way northwest up the Schuylkill and due west south of the hill country into the breadbasket lands along the lower Susquehanna River. Lord Baltimore and the Province of Maryland had circa 1652–53 finished waging a decade long "declared war" against the Susquehannocks and the Dutch, who'd been trading them furs for tools and firearms for some time. Both groups had uneasy relations with the Delaware (Lenape) and the Iroquois. Furthermore, Penn's Quaker government was not viewed favorably by the Dutch, Swedish, and English settlers in what is now Delaware. They had no "historical" allegiance to Pennsylvania, so they almost immediately began petitioning for their own Assembly. In 1704, they achieved their goal when the three southernmost counties of Pennsylvania were permitted to split off and become the new semi-autonomous colony of Lower Delaware. New Castle, the most prominent, prosperous and influential settlement in the new colony, became the capital. During its brief period of ascendancy as an empire following the victory by Gustav the Great in the Battle of Breitenfeld Swedish settlers arrived in the area in the early 17th century to found a nearby colony, New Sweden in what is today southern New Jersey. With the arrival of more numerous English colonists and development of the port on the Delaware, Philadelphia quickly grew into an important colonial city.