chainbearer
/ˈtʃeɪnˌbeərər/Definitions
1. noun
A person who carries a chain, especially a chain of office.
“The mayor of the town was the chainbearer in the annual parade.”
2. noun
A person who bears or carries the chain of office in a ceremony or procession.
“The university’s vice-chancellor acted as the chainbearer in the graduation ceremony.”