By contrast, Britannicus was progressively isolated. At the games of the circus Nero appeared in triumphal robes while Britannicus was still dressed as a boy. Tacitus says their clothing at the games affected the expectations of the people: with Nero in a general's clothing, and Britannicus in the dress of boyhood. He wouldn't be due for the toga until 12 February AD 55. He and his supporters were seen as a potential problem for Nero. Agrippina replaced his tutors with her own nominees, having convinced Claudius to order their executions, including the execution of Sosibius. Not just his tutors, but the two prefects of the Praetorian Guard, Lusius Geta and Rufius Crispinus, were replaced as well. They were thought to be sympathetic to the cause of Britannicus and his mother, as Tacitus reports: it would have been risky to surround Nero with any but those loyal to Claudius and Agrippina. His step-mother had them replaced with Sextus Afranius Burrus who was a good soldier, but knew to whom he owed his allegiance.