Unraveling the Mystery of Leopold Bloom’s Father

As a teacher of James Joyce’s Ulysses, I have always been intrigued by the European wanderings of Rudolph Virag Bloom who in the penultimate Ithaca chapter of the book is said to have “narrated to his son Leopold Bloom (aged 6) a retrospective arrangement of migrations and settlements in and between Dublin, London, Florence, Milan, Vienna, Budapest, Szombathely with statements of satisfaction (his grandfather having seen Maria Theresia, empress of Austria, queen of Hungary), with commercial advice (having taken care of pence, the pounds having taken care of themselves). Leopold Bloom (aged 6) had accompanied these narrations by constant consultation of a geographical map of Europe (political) and by suggestions for the establishment of affiliated business premises in the various centres mentioned.”
Why did Rudolph, a Jewish man from a small town in the Austro-Hungarian Empire, go to all these major European cities? What were his business dealings in each one? What were the specifics of his personal life? Why did he commit suicide? As a writer, I am being drawn to create a backstory to fill in the blanks and answer these questions. In short, this would be a prequel to Ulysses! Wish me luck. I’m going to give it a shot. If there are those reading this post, who may have suggestions for me in creating this backstory, it would be greatly appreciated.