Behind the first five sections of auxiliaries came the four wagons, heavy vehicles drawn by ten mules each. A soldier sat on the bench beside each of the drivers and behind them stretched the goatskin covers, tightly tied over the locked chests resting on the beds of the wagons. There were five chests in each wagon, each containing one hundred thousand freshly minted denarii - two million in all, enough to pay an entire legion for a year.

Balbus could not help a moment of brief speculation about what he could do with such a fortune. Then he dismissed the whimsy. He was a soldier. He had given his oath to protect and obey the Emperor. His duty was to see that the wagons reached the treasury in Rome. Balbus’s lips tightened as he recalled that some of his fellow Praetorians had a somewhat more flexible understanding of the concept of duty.

It was less than ten years ago that members of the Praetorian Guard had murdered the previous Emperor and his family. True, Gaius Caligula had been a raving madman and tyrant, but an oath was as solemn a commitment as Balbus could think of. He still disapproved of the removal of Caligula, even though the new Emperor chosen by the Praetorians had proved to be a rather better ruler. The accession of Claudius had been a confused affair, Balbus recalled. Those officers who had murdered his predecessor had intended to return power to the Roman senate. However, once the rest of their comrades realised that no emperor meant no Praetorian Guard, with all the privileges that went with the job, they swiftly cast around for a successor to the throne, and came up with Claudius. Infirm and stammering, he was hardly the ideal figurehead for the greatest empire in the known world, but he had proved himself a generally fair and effective ruler, Balbus conceded.

His gaze shifted to the last five sections of the German auxiliaries marching behind the wagons. While they might not look like proper soldiers, Balbus knew that they were good in a fight, and their reputation was such that only the most foolhardy of brigands would dare to attack the convoy. Anyway, the danger, such as it was, had passed as the convoy descended on to the broad flat valley of the River Po.

He clicked his tongue and pressed his boots into the flanks of his mount. With a brief snort the horse lurched forward into a walk and Balbus steered it back on to the road, passing the leading ranks of auxiliaries and their commander, Centurion Arminius, until he had resumed his position at the head of the convoy. They had made good time. It was not yet noon and they would reach Picenum within the hour, there to await the Praetorian escort if it had not already reached the town.