Since Elizabethan times, the symbol of authority for a British admiralty court has been a silver oar, placed before the judge when the court is in session. In this respect the silver oar is the equivalent of a ceremonial mace, representing the authority of the Crown and the Lord High Admiral of the United Kingdom. An antique silver oar is still placed before the bench when the High Court sits in London on matters relating to its admiralty court functions; in past times it was borne by the marshal in procession, not only in court but on occasions of arrest of persons or vessels, and also on the way to Execution Dock for the last journey of those convicted of piracy. The date of the London oar is uncertain: it is depicted on the tomb of David Lewis, Judge of the High Court of Admiralty from 1559 until 1584, there is some evidence that it may date from the beginnings of the court in the fourteenth century, though one of several assay marks suggests that it was remade three centuries later (based on the earlier pattern). Local courts and vice-admiralty courts had their own silver oars; early examples survive from colonial courts in Bermuda (1701), Boston (1725), New York City (c. 1725), Colombo (1801), Cape of Good Hope (1806) and Calcutta.