Page "Julius Nepos" Paragraph 19

Similar arrangements might have continued for many years had events not taken another course.

First, in about 479, Nepos began to plot against Odoacer, hoping to regain control of Italy for himself.

Another possibility, ( according to some sources ) is that Glycerius, who continued as bishop of Salona, was plotting his revenge.

What is certain is that Odoacer perceived Nepos as a threat, and was determined to get rid of him.