The Indo-Greek Kingdom (or sometimes Graeco-Indian Kingdom) covered various parts of the northwest and northern Indian subcontinent from 180 BCE to around 10 CE, and was ruled by a succession of more than 30 Hellenistic kings, often in conflict with each other. The kingdom was founded when the Greco-Bactrian king Demetrius invaded India in 180 BCE, ultimately creating an entity which seceded from the powerful Greco-Bactrian Kingdom centered in Bactria (today's northern Afghanistan). Since the term "Indo-Greek Kingdom" loosely describes a number of various dynastic polities, it had numerous capitals, but the city of Taxila in northern Pakistan was probably among the earliest seats of local Hellenic rulers, though cities like Pushkalavati and Sagala (apparently the largest of such residences) would house a number of dynasties in their times, and based on Ptolemy's Geographia and the nomenclature of later kings, a certain Theophila in the south was also probably a satrapal or royal seat at some point.