Rows were built in the four main streets leading from Chester Cross, each of which originated during the settlement's early development. In the Roman period the main street, now Watergate Street and Eastgate Street, lay on an east–west axis. It was joined at what is now Chester Cross by the main road from the south, present-day Bridge Street. During the
Saxon period, a road to the north was added which is now called Northgate Street.
Dendrochronological evidence shows that the Rows go back as far as the 13th century, Because the Rows are unique and their precise origins are unknown, they have been the subject of speculation. Chester has suffered from a series of fires. In 1278 the fire was so severe that almost the entire town within the walls was destroyed. It has been suggested that following this fire, the owners were ordered to make their ground floors fireproof, leading to the stone-lined undercrofts. From this, the suggestion has been made that there was "a general undertaking by the citizens of Chester ... to improve the commercial potential of their property by providing two-level access for customers". The 19th-century writer
George Borrow makes the following claim in his book
Wild Wales, published in 1862: "All the best shops in Chester are to be found in the rows. These rows, which you ascend by stairs up narrow passages, were originally built for the security of the wares of the principal merchants against the Welsh. Should the mountaineers break into the town, as they frequently did, they might rifle some of the common shops, where their booty would be slight, but those which contained the most costly articles would be beyond their reach; for at the first alarm the doors of the passages, up which the stairs led, would be closed, and all access to the upper streets cut off, from the open arches of which missiles of all kinds, kept ready for such occasions, could be discharged upon the intruders, who would soon be glad to beat a retreat." Another theory links the Rows with the
debris left from the Roman occupation of Chester. The rubble from the Roman buildings which had fallen into ruin was piled up alongside the streets. One theory suggests that in the medieval period buildings were constructed along the top of this debris. The buildings were set back from the street, a footpath passed in front of them, and wheeled vehicles passed along the street below. In time, the properties were improved and possibly during the 13th century, cellars or undercrofts were excavated in the debris beneath them. When the buildings were further improved, upper storeys were built which overlapped the lower storey, providing a covered walkway. Stalls or shelves were added on the street side of the walkway for the display of goods, and so the system of Rows was developed. In a few places, for example at the corner of Eastgate Street and Northgate Street, another building was constructed between the walkway and the street. It is thought that, apart from a relatively small number of later buildings, the system of the Rows had reached its full extent by about 1350. ==Medieval period==