Ptolemy in Justin was Ptolemy the disciple of Valentinus?

Harnack first suggested this:
They are roughly contemporary, associated with Rome, and teachers of women.

Justin, 2nd Apology 2

And her quondam husband, since he was now no longer able to prosecute her, directed his assaults against a man, Ptolemæus, whom Urbicus punished, and who had been her teacher in the Christian doctrines. And this he did in the following way. He persuaded a centurion — who had cast Ptolemæus into prison, and who was friendly to himself— to take Ptolemæus and interrogate him on this sole point: whether he were a Christian? And Ptolemæus, being a lover of truth, and not of a deceitful or false disposition, when he confessed himself to be a Christian, was bound by the centurion, and for a long time punished in the prison And, at last, when the man came to Urbicus, he was asked this one question only: whether he was a Christian? And again, being conscious of his duty, and the nobility of it through the teaching of Christ, he confessed his discipleship in the divine virtue. For he who denies anything either denies it because he condemns the thing itself, or he shrinks from confession because he is conscious of his own unworthiness or alienation from it, neither of which cases is that of the true Christian. And when Urbicus ordered him to be led away to punishment, one Lucius, who was also himself a Christian, seeing the unreasonable judgment that had thus been given, said to Urbicus: What is the ground of this judgment? Why have you punished this man, not as an adulterer, nor fornicator, nor murderer, nor thief, nor robber, nor convicted of any crime at all, but who has only confessed that he is called by the name of Christian? This judgment of yours, O Urbicus, does not become the Emperor Pius, nor the philosopher, the son of Cæsar, nor the sacred senate. And he said nothing else in answer to Lucius than this: You also seem to me to be such an one. And when Lucius answered, Most certainly I am, he again ordered him also to be led away. And he professed his thanks, knowing that he was delivered from such wicked rulers, and was going to the Father and King of the heavens. And still a third having come forward, was condemned to be punished.