At the time of Boudicca, the Roman occupation of ‘Britannia’ was relatively new, but there was already a form of peace and mutual acceptance, even co-existence, with many of the native tribes, the Iceni included. But the tiger will always use its claws, and the opportunity for Rome to increase its wealth, territory and power after the death of Iceni king Prasutagus in c.60-61 CE was too good to miss. The resulting violence and dishonouring of the Iceni sparked a revolt against the Romans that would settle the balance of power in Britannia for centuries to come.
How were the Boudiccan rebels able to initially defeat the Romans in the revolt the queen led in c.60-61 CE?
At the heart of this answer is the specific time when the Boudiccan Revolt broke out. This was effectively the halfway point in the Roman campaigns of conquests in Britain in