| This species, known scientifically as Macaca sylvanus, is listed as endangered by the IUCN Red List and is declining. |
| On 13 January 1963, one of Nkrumah's betes noires in Africa, the president of neighbouring Togo, Sylvanus Olympio, was assassinated in a coup and his government overthrown. |
| Sylvanus Bowser of Fort Wayne, Indiana made the pump for a customer to dispense a single barrel of fuel for lamps and stoves. |
| Sylvanus Thayer, West Point's fifth superintendent and known as the ''Father of the Military Academy. |
| Rejoicing, singing songs, honoring her as their Queen, waving branches, scattering flowers beneath her feet, they lead her to their chief Sylvanus. |
