Who was the commander of the invasion of Britain under Claudius?

The commander of the invasion of Britain under Emperor Claudius was Aulus Plautius. In AD 43, Claudius sought to expand Roman influence by invading Britain, and he entrusted the military leadership of this campaign to Aulus Plautius. He successfully led Roman forces into Britain, where they encountered various tribal groups. Plautius's military strategy and leadership resulted in the establishment of a Roman foothold in Britain, which laid the groundwork for subsequent Roman colonization and governance in the region.

Julius Caesar had made earlier attempts to invade Britain in 55 and 54 BC, but his campaigns were not intended to establish permanent conquest. Gnaeus Pompeius is more associated with the governance and military actions in other parts of the Roman Republic and does not pertain to the Claudian conquest. Trajan, known for his own military campaigns, ruled much later, after the time of Claudius and Plautius, and did not participate in the initial invasion of Britain.