and stories of the founding Roman and the Roman Church and is dated to the early eighth century. The Gosforth Cross, dated to the early tenth century, stands at 4.4 meters and is richly decorated with carvings of mythical beasts, Norse gods, and Christian symbolism. Stone sculpture was not a practice of native Scandinavian culture, and the proliferation of stone monuments within the Danelaw shows the influence that the English had on Viking settlers. On one side of the Gosforth Cross is a depiction of the Crucifixion; whilst on the other are scenes from Ragnarok. The melding of these distinctive religious cultures can further be seen in the depiction of Mary Magdalene as a valkyrie, with a trailing dress and long pigtail. Although one can read the iconography as the triumph of Christianity over paganism, it is possible that in the process of gradual conversion the Vikings might have initially accepted the Christian god as an addition to the broad pantheon of Pagan gods. The inclusion of pagan traditions in visual culture reflects the creation of a distinctive Anglo-Scandinavian culture. Consequently, this indicates that conversion not only required a change in belief, but also necessitated its assimilation, integration, and modification into existing cultural structures. Economy Northumbria's economy centred around agriculture, with livestock and land being popular units of value in local trade. By the mid 800s, the Open field system was likely the pre-eminent mode of farming. Like much of eastern England, Northumbria exported grain, silver, hides, and slaves. Imports from Frankia included oil, luxury goods, and clerical supplies in the 700s. Especially after 793, raids, gifts, and trade with Scandinavians resulted in substantial economic ties across the North Sea. When coinage (as opposed to bartering) regained popularity in the late 600s, Northumbrian coins featured kings' names, indicating royal control of currency. Royal currency was unique in Britain for a long time. King Aldfrith (685–705) minted Northumbria's earliest silver coins, likely in York. Later royal coinage bears the name of King Eadberht (738–758), as well as his brother, archbishop Ecgbert of York. These coins were primarily small silver sceattas, more suitable to small, everyday transactions than larger gold Frankish or Roman coins. During the reign of King Eanred the silver content of the coins declined until they were produced in copper alloy, these coins are commonly known as stycas, but the term is an antiquarian invention. Stycas remains in use