This man, as I stated above, was sent to escort Demetrius. The young prince was incautious and angry, not without reason, at the way his relations treated him. Didas humoured him and pretended to be indignant on his account, and offered, unsolicited, to assist him in every way, and gave him his word of honour to be true to him. In this way he succeeded in eliciting his secret thoughts. Demetrius was meditating flight to the Romans and hoped to get away safely across Paeonia. That the governor of this province should further his project he regarded as a boon from heaven. This design was at once betrayed to his brother, and on his advice communicated to his father. A letter was sent to Philip while he was besieging Petra. On this, Heliodorus, the leading man amongst the friends of Demetrius, was flung into prison and orders were given to keep a secret watch on Demetrius. This more than anything else made the king's journey to Macedonia a very melancholy one. This new charge disturbed him greatly, but he felt that he ought to await the return of those who had been sent to find out everything in Rome. For some months he remained in suspense; at length his envoys returned after having settled beforehand in Macedonia what report they should bring back from Rome. In addition to all their other treachery, they handed to the king a forged letter sealed with a counterfeit of T. Quinctius' seal. The letter deprecated any harsh judgment of Demetrius, and stated that whatever communication the young prince in his eagerness for the crown had had with him, T. Quinctius, he was certain that he would do nothing to injure any of his relatives, nor was the writer a man who could be thought to countenance any unfilial conduct. This letter made Perseus' accusations appear more credible. Heliodorus was at once submitted to torture and died without implicating anyone.