Johann I, Graf von Habsburg-Laufenburg

-https://en.wikipedia.org/wiki/Johann_I_(Habsburg-Laufenburg)

Johann was born around between 1295 and 1297 AD probably in the Rapperswil Castle in the medieval city of Rapperswil. From Elisabeth's second marriage in spring 1296 with Count Rudolf von Habsburg-Laufenburg († 1315),[1] Johann I von Habsburg-Laufenburg was born roughly around 1297. Siblings of Johann are not recorded, but his stepbrother Wernher von Homberg and his stepsister Cecilia von Homberg born to Countess Elisabeth by first marriage with Count Ludwig von Homberg. Johann may be raised in Laufenburg and even educated at the royal Habsburg court, as well as his son Johann († 17. Dezember 1380) and those brothers Johann IV and Gottfried after the death of Johann I.

https://en.wikipedia.org/wiki/Elisabeth_von_Rapperswil