In Bewitched Season 4 Episode 17 (12/28/67) Aunt Clara will bring Leonardo DaVinci to the present almost a year and a half after Uncle Martin did.
Catapults were standard war machines as far back as ancient Greece. In 1485 DaVinci designed a novel, and arguably improved, form of catapult involving a paw and ratchet windlass and wooden leaf springs. This design became rather famous.