Table:
text: Canonicus-class monitor
Ships
Ships
Ship Builder Namesake Renamed Laid_down Launched Commissioned_or_completed_
Ajax Snowden & Mason, Pittsburgh, Pennsylvania Manayunk, Philadelphia Manayunk, 1862; Ajax, 15 June 1869 1862 18 December 1864 27 September 1865*
Canonicus Harrison Loring, Boston, Massachusetts Canonicus Scylla, 15 June 1869; Canonicus, 10 August 1869 1862 1August1863 16 April 1864
Catawba Alexander Swift & Company, Cincinnati, Ohio Catawba River Atahualpa 1862 13 April 1864 10 June 1865*
Mahopac Secor & Co., Jersey City, New Jersey Lake Mahopac Castor, 15 June 1869; Mahopac, 10 August 1869 1862 17 May 1864 22 September 1864

Question: What is the namesake of the ship commissioned or completed by the Canonicus-class monitor on April 16, 1864?