It is acknowledged that Oliver St John Gogarty was the model for Malachi Mulligan in James Joyce's Ulysses. The picture is of young Gogarty.

In the Scylla and Charybdis episode the subject is a party that the author George Moore is hosting that night. John Eglinton says to Stephen, " I hope you'll be able to come tonight. Malachi Mulligan is coming too. Moore asked him to bring Haines." However, Stephen had not received an invitation to the party. In real life Gogarty had been invited to Moore's party, but not Joyce.

This may have led to what could be called the Moore-Gogarty-Joyce "two dactyl" (one stressed and two unstressed syllables) connection. In the opening episode of Ulysses the narrative:

-- My name is absurd too: Malachi Mulligan, two dactyls. But it has
a Hellenic ring, hasn't it?

The name Oliver Gogarty also has two dactyls, which was Joyce's playful way of flaunting his language skills to Gogarty. It may have also been Joyce's way of outwitting Moore as a rebuff for his not getting an invitation to his party. Moore wrote a short story in 1905 "The Lake" in which the protagonist, a priest, is named Oliver Gogarty. When Gogarty's mother questioned Moore about it he presumably said, "Madame supply me with two such joyous dactyls and I will gladly change the name." So in the end Joyce may not only have had the last laugh, but the defining dactyl as well.

The following link provides biographical information on Oliver St John Gogarty.

http://en.wikipedia.org/wiki/Oliver_St._John_Gogarty