He might be bedridden.
He might be in the West Indies.

He might be in prison.

Indeed there notoriously were such cases.

Among the attainted Lords was Mountjoy.

He had been induced by the villany of Tyrconnel to trust himself at Saint Germains: he had been thrown into the Bastile: he was still lying there; and the Irish parliament was not ashamed to enact that, unless he could, within a few weeks, make his escape from his cell, and present himself at Dublin, he should be put to death, [230] As it was not even pretended that there had been any inquiry into the guilt of those who were thus proscribed, as not a single one among them had been heard in his own defence, and as it was certain that it would be physically impossible for many of them to surrender themselves in time, it was clear that nothing but a large exercise of the royal prerogative of mercy could prevent the perpetration of iniquities so horrible that no precedent could be found for them even in the lamentable history of the troubles of Ireland.