Capital city meaning "head". In several English-speaking states, the terms county town and county seat are also used in lower subdivisions. In some unitary states, subnational capitals may be known as "administrative centres". The capital is often the largest city of its constituent, though not always. Historically, the major economic centre of a state or region often becomes the focal point of political power, and becomes a capital through conquest or federation. (The modern capital city has, however, not always existed: in medieval Western Europe, an itinerant (wandering) government was common.) Examples are Ancient Babylon, Abbasid Baghdad, Ancient Athens, Rome, Constantinople, Chang'an,
Spanish Steps of a more famous son, Gian Lorenzo Bernini, who is recently said to have collaborated on the decoration. The elder Bernini had been the pope's architect for the Acqua Vergine, since 1623. According to a legend, Pope Urban VIII had the fountain installed after he had been impressed by a boat brought here by a flood of the Tiber. In the piazza, at the corner on the right as one begins to climb the steps, is the house where English poet John Keats lived and died in 1821; it is now a museum dedicated to his memory, full of memorabilia