What province did Germanicus visit without Tiberius's permission?

Germanicus visited Egypt without the permission of Tiberius, primarily because of the significance that Egypt held in the Roman Empire, particularly regarding its grain supplies and political influence. This visit was viewed with suspicion by Tiberius, who was concerned about the power dynamics and potential threats to his rule, as leaders visiting important provinces without authorization could be interpreted as seeking greater authority or popularity.

The context of Germanicus's relationship with Egypt also ties into the broader narrative of Roman imperial politics at the time, as military leaders often traveled to such key regions to both assert control and cultivate connections. Tiberius's apprehension highlighted the tension between sovereign authority and the ambitions of powerful generals like Germanicus.

Other options have their significance, but do not align with the specific context of Germanicus's unapproved visit. Gaul and Britannia were regions where Roman military presence was normalized, while Judea dealt with different political complexities, particularly regarding local governance and unrest.