M. Moliner gives ostentatious, but with the little you give I'm assuming that it more pretentious or vainglorious. More details would be nice!

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Note added at 12 hrs (2010-06-03 08:26:26 GMT)
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Some examples: James D. Simmonds - 1972 - Literary Criticism - 224 páginas
The preachers and Milton alike regard Satan as the archetypal conspirator, who invented ... to mock the pretentious futility of the gunpowder plotters. ...
books.google.es/books?isbn=082293244X...
The author includes considerable information about the vainglorious Booth, ... and the resulting manhunt for John Wilkes Booth and his co-conspirators. ...
search.barnesandnoble.com/Chasing.../9780545119436 - En caché
levity and laxity, but Antoine and his entourage had correctly gauged the limitations of this doctrinaire firebrand and vain-glorious conspirator ...
www.jstor.org/stable/25518940
vainglorious ruler of a Caribbean island: “From stowaway to Emperor in two years”, he boasts to his white cockney co-conspirator. “That's going some! ...
www.wikiwak.com/red/Conspirators_(play)