Mbaise are notably the best examples of an Igbo group claiming autochthony; they reject theories of many migratory histories about their origins. Based on the proximity of traditions to those of their neighbours, and familial and political ties, many of these groups are apparently culturally northern or southern Igbo. The first Igbo Ukwu metal and precious artefacts finds were made accidentally in 1939, when a resident named Isiah Anozie found them in the process of digging a cistern. This led to the discovery of a larger network of linked metal works from the 9th century. The works were based in Igbo Ukwu. Further finds were made found by archaeology teams led by Thurstan Shaw in 1959–60, and in 1964 in the compound of Jonah Anozie. Initially, throughout the 1960s and 1970s, scholars believed that the Igbo Ukwu bronze and copper items found here had been made elsewhere and were trade goods, or were influenced by outside technology due to their technical sophistication. The opposite was revealed to be true: local copper deposits had been exploited by the 9th century and anthropological evidence, such as the Ichi-like scarifications on the human figures, show the items were of local Igbo cultural origin. The works have since been attributed to an isolated bronze industry, which had developed without outside influence over time and reached great sophistication. Igbo trade routes of the early second millennium reached the cities of Mecca, Medina and Jeddah through a network of trade routes journeyed by middlemen. Beads that originated in India in the 9th century have been found in Igbo Ukwu burial sites: Thousands of glass beads were uncovered from the ruined remains of a nobleman's garments. The burial site was associated with the Nri Kingdom, which began around the same century, according to indigenous history. The northern Igbo Kingdom of Nri, rising around the 10th century based on Umunri traditions, is credited with the foundation of much of Igboland's culture, customs, and religious practices. It is the oldest existing monarchy in present-day Nigeria. It was around the mid-10th century that the divine figure Eri is said to have migrated, according to Umunri lore, to the Anambra () river basin — specifically at its meeting with Ezu river known as Ezu na Omambara in present-day Aguleri. The exact origins of Eri are unknown and much of Nri traditions present him as a divine leader and civiliser sent from heaven to begin civilisation.