Ugianranran (manillas) are highly important objects in the visual language of the Emwin Arhe (royal treasures). Although Ugianranran were made in a variety of sizes, forms, and weights, they share the characteristics of being made from copper or copper alloys, namely brass or bronze, and having a curved, ring- or horseshoe-shaped form.

In the early years of trade between the Portuguese and Edo, during the late 15th and early 16th centuries, manillas were made primarily of copper. During the early 16th century, Edo traders increasingly sought manillas made of brass. This changing preference is believed to have corresponded with the growing demand for brass among artists of the Igun-Ẹrọnmwọn ( ). During the 17th and early 18th centuries, the Dutch also traded manillas with the Edo, although to a lesser extent than the Portuguese. Recent scientific analysis has shown similarities between the composition of metals in manillas from the southern Rhineland region of Germany and the copper alloys used in some Emwin Arhe, supporting earlier scholarship suggesting that manillas were used by casters to produce Emwin Arhe (Skowronek et al. 2023).

When depicted on objects, Ugianranran are often shown alongside or being held by figures identified as Portuguese. In one case, figures identified as Benin traders or royal emissaries are shown holding manillas in their hands ( ). This is particularly the case on the Ama-Ẹrọnmwọn (bronze relief plaques), which are believed to have been commissioned by Ọba Esigie. Esigie is understood to have encouraged the production of artworks, made possible in part by the increased supply of manillas and other copper-alloy objects resulting from trade ( ). Ugianranran are therefore associated with overseas trade, wealth, and Olokun, the deity of the seas ( ). In addition to being held by figures or appearing alongside them on artworks, Ugianranran sometimes serve as focal decorative motifs, further indicating their symbolic and economic potency.

Ikpotoki figures (Portuguese figures) are easily distinguished by their European-style clothing, including hats and helmets, as well as by their facial features, particularly their thin, straight noses and straight hair. The objects Ikpotoki figures are shown wearing or holding provide further indications of their relationship with the Benin Kingdom. When they hold or are positioned alongside Ugianran (manillas), for example, they indicate trade, commerce, and wealth, while weaponry such as firearms, swords, or spears indicates their role as mercenaries in the service of the Ọba. In 1515, Ọba Ẹsigie went to war against the Attah of Idah, the ruler of a neighbouring kingdom. Portuguese mercenaries and weapons assisted the Edo in winning the battle, enabling the further expansion of the Kingdom. Ẹsigie’s reign was particularly important for strengthening ties between the Benin Kingdom and the Portuguese Empire, and he is believed to have spoken fluent Portuguese. With Ẹsigie’s encouragement, Portuguese missionaries established churches in the Benin Kingdom ( ; ), while Portuguese trading factories were also established ( ). Ọba Ẹsigie allowed his son to be baptised and sent him to Portugal to be educated; following his return, he became Ọba Orhogbua ( ).

In the riverine area surrounding Benin City, there are two types of crocodile. The Ẹghughu, known in English as the dwarf or bush crocodile, is believed to be more docile ( ; Ọbazee 2025, p. 133). The second type is the Àgbákà, the aggressive Nile crocodile ( ; Ọbazee 2025, p. 11).

Crocodiles are one of the important animals represented in the historical Emwin Arhe, and they are known as Olokun’s guards or the “policemen” of the waters. The powerful and ferocious qualities of these animals might explain why warrior figures are often depicted wearing Uhunmwu-Ẹkuẹ (pendant masks) in the shape of crocodile heads on Ama-Ẹrọnmwọn (bronze relief plaques) ( ). Olokun devotees use crocodiles as sacrificial animals in offerings during the worship of Olokun.

The Ubanu'hi (infinity symbol) is a kind of guilloche or interlaced strapwork motif that can be angular or rounded. It was used by Edo artists in the decoration of many Emwin Arhe (royal treasures) and is ubiquitous in Benin royal arts. Ubanu'hi is a shortened form of “uba no Ọba ya de agbon ke ehimwin yi”, which means “the rope with which the Ọba ties the heaven and earth together” (pers. comm. Chief John Igbineweka Inneh n’Igbesawman, 2022). Similarly, Paula Ben-Amos Girshick (in Plankensteiner 2007, pp. 339, 341) described this as “Ọba n’iri agbon”, or the “rope of the world” pattern.

According to Ọbabanmu Ineh (in Blackmun 1984, p. 51), the use of this motif indicates that objects were carved by members of the Igbesanmwan. However, the motif is found on all types of Emwin Arhe (royal treasures), not only those made of ivory or wood. On the flanges of the Ama (relief plaques) alone, Kathryn Gunsch (2018, pp. 75–77) identified three different versions of the Ubanu'hi and, through her analysis of over 850 plaques, found that these different Ubanu'hi forms align with other characteristics, such as dimensions, the prevalence of ornamental motifs, and stylistic qualities. Together, these provide evidence, she argues, of different production groups among the plaque makers .

Kate Ezra (1992, pp. 209, 264) went on to argue that the use of these motifs indicates that certain objects were used in a “royal context” and were associated with “royal patronage”.