That closing "as of" clinches the ambiguity: Dunbar cannot be claimed directly as one's heritage. The poem, while gauche, is not gauche enough for that. But the poet may think of him "as of" his heritage: at the same time, in the same moment, with a sense of communication between times and moments. It is a matter of "faith" in a "Fulness of vision" which one has not oneself attained, but which is glimpsed through the moments in which past figures seemed to "bring the heavens near".To such a mercy few of us attain:
Swans dwell apart like Troilus in his sphere,
And not by sufferings, even, do we gain
Power, such as theirs, to bring the heavens near,
But win our faith from all who knew the clear
Fulness of vision. Here, on Bewdley bridge,
I think of you, as of my heritage.