Final answer:
The exact design of the Wallachian voivodes' crowns is not well-documented, but they could be simple to highly ornate based on medieval European practices. Such crowns often featured gold and jewels, reflecting the prestige and power of royal authority during that period.
Step-by-step explanation:
The crowns of the Wallachian voivodes are not extensively documented when it comes to their precise appearance, particularly compared to other historical crowns whose details have been well-recorded. However, given the nature of medieval European regalia, a general understanding can be had from examining the coronation regalia and crowns of contemporary regions. The crown's design could range from simple and plain to golden with jewels, depending on the resources available and the influence of neighboring cultures.
During the medieval era, crowns symbolized power and were often made of precious metals such as gold or silver, and could be adorned with jewels, enamel, and other decorations.
For example, the treasury of the cathedral of Troy houses an ivory casket indicative of the luxurious items associated with royal authority, and the Gold Crown of Silla showcases the skill in gold working in some regions. The Coronation Mantle from the 12th century reflects the opulent use of materials like gold, silk, and precious stones in royal attire.