He belonged to the Decadent movement in art, often relying on erotic themes and phantasmagoric imagery. Bayros was born in Zagreb, in present-day Croatia, then part of the Austro-Hungarian Empire. At the age of seventeen, he passed the entrance examination for the Vienna Academy with Eduard von Engerth.
The next year, Bayros moved to Munich.
In 1904, he gave his first exhibition in Munich, which was a great success. From 1904 until 1908, he travelled to Paris and Italy for further studies.
Returning to Vienna, he felt himself a stranger. The outbreak of the First World War came as yet another setback for Bayros.
The artist died at Vienna in 1924, from a cerebral hemorrhage.