Utrecht. Utrecht is the fourth-largest city and a municipality of the Netherlands, capital and most populous city of the province of Utrecht. It is located in the eastern corner of the Randstad conurbation, and in the very centre of mainland Netherlands, and had a population of 347,574 in 2018. Utrecht's ancient city centre features many buildings and structures, several dating as far back as the High Middle Ages. It has been the religious centre of the Netherlands since the 8th century. It lost the status of prince-bishopric but remains the main religious centre in the country. Utrecht was the most important city in the Netherlands until the Dutch Golden Age, when it was surpassed by Amsterdam as the country's cultural centre and most populous city. Utrecht is host to Utrecht University, the largest university in the Netherlands, as well as several other institutions of higher education. Due to its central position within the country, it is an important transport hub for both rail and road transport. It has the second highest number of cultural events in the Netherlands, after Amsterdam.In 2012, Lonely Planet included Utrecht in the top 10 of the world's unsung places. Although there is some evidence of earlier inhabitation in the region of Utrecht, dating back to the Stone Age and settling in the Bronze Age, the founding date of the city is usually related to the construction of a Roman fortification, probably built in around 50 CE.A series of such fortresses was built after the Roman emperor Claudius decided the empire should not expand further north. To consolidate the border, the Limes Germanicus defense line was constructed along the main branch of the river Rhine, which at that time flowed through a more northern bed compared to today. These fortresses were designed to house a cohort of about 500 Roman soldiers. Near the fort, settlements would grow housing artisans, traders and soldiers' wives and children. In Roman times, the name of the Utrecht fortress was simply Traiectum, denoting its location at a possible Rhine crossing. Traiectum became Dutch Trecht; with the U from Old Dutch uut added to distinguish U-trecht from Maas-tricht. In 11th-century official documents, it was Latinized as Ultra Traiectum.Around the year 200, the wooden walls of the fortification were replaced by sturdier tuff stone walls, remnants of which are still to be found below the buildings around Dom Square. From the middle of the 3rd century, Germanic tribes regularly invaded the Roman territories. Around 275 the Romans could no longer maintain the northern border and Utrecht was abandoned. Little is known about the next period 270-650. Utrecht is first spoken of again several centuries after the Romans left. Under the influence of the growing realms of the Franks, during Dagobert I's reign in the 7th century, a church was built within the walls of the Roman fortress. In ongoing border conflicts with the Frisians, this first church was destroyed. By the mid-7th century, English and Irish missionaries set out to convert the Frisians. Pope Sergius I appointed their leader, Saint Willibrordus, as bishop of the Frisians. The tenure of Willibrordus is generally considered to be the beginning of the Bishopric of Utrecht. In 723, the Frankish leader Charles Martel bestowed the fortress in Utrecht and the surrounding lands as the base of the bishops. From then on Utrecht became one of the most influential seats of power for the Roman Catholic Church in the Netherlands.The archbishops of Utrecht were based at the uneasy northern border of the Carolingian Empire. In addition, the city of Utrecht had competition from the nearby trading centre Dorestad. After the fall of Dorestad around 850, Utrecht became one of the most important cities in the Netherlands. The importance of Utrecht as a centre of Christianity is illustrated by the election of the Utrecht-born Adriaan Florenszoon Boeyens as pope in 1522. Main article: Bishopric of Utrecht When the Frankish rulers established the system of feudalism, the Bishops of Utrecht came to exercise worldly power as prince-bishops. The territory of the bishopric not only included the modern province of Utrecht, but also extended to the northeast. The feudal conflict of the Middle Ages heavily affected Utrecht. The prince-bishopric was involved in almost continuous conflicts with the Counts of Holland and the Dukes of Guelders.