royal family of the other state. Nubiologist Włodzimierz Godlewski states that it was under the Makurian king Merkurios (early 8th century) that the two kingdoms began to approach each other. In 943 al Masudi wrote that the Makurian king ruled over Alodia, while Ibn Hawqal wrote that it was the other way around. The 11th century saw the appearance of a new royal crown in Makurian art; it has been suggested that this derived from the Alodian court. King Mouses Georgios, who is known to have ruled in Makuria in the second half of the 12th century, most likely ruled both kingdoms via a personal union. Considering that in his royal title ("king of the Arouades and Makuritai") Alodia is mentioned before Makuria, he might have initially been an Alodian king. Decline Archaeological evidence from Soba suggests a decline of the town, and therefore possibly the Alodian kingdom, from the 12th century. By 1300 the decline of Alodia was well advanced. No pottery or glassware postdating the 13th century has been identified at Soba. Two churches were apparently destroyed during the 13th century, although they were rebuilt shortly afterwards. It has been suggested that Alodia was under attack by an African, possibly Nilotic, people called Damadim who originated from the border region of modern Sudan and South Sudan, along the Bahr el Ghazal River. According to geographer Ibn Sa'id al-Maghribi, they attacked Nubia in 1220. Soba may have been conquered at this time, suffering occupation and destruction. In the late 13th century, another invasion by an unspecified people from the south occurred. In the same period poet al-Harrani wrote that Alodia's capital was now called Waylula, described as "very large" and "built on the west bank of the Nile". In the early 14th century geographer Shamsaddin al-Dimashqi wrote that the capital was a place named Kusha, located far from the Nile, where water had to be obtained from wells. The contemporary Italian-Mallorcan Dulcert map features both Alodia ("Coale") and Soba ("Sobaa"). Economic factors also seem to have played a part in Alodia's decline. From the 10th to 12th centuries the East African coast saw the rise of new trading cities such as Kilwa. These were direct mercantile competitors since they exported similar goods to Nubia. A period of severe droughts occurring in Sub-Saharan Africa between 1150 and 1500 would have affected the Nubian economy as well. Archeobotanical evidence from Soba