Wikipedia claims that Randolph Henry Ash is based on Robert Browning and/or Alfred Lord Tennyson, but provides no citation. You might want to investigate that article further.

The New York Times also makes a similar claim, but says that Randolph Henry Ash is an "obvious stand-in for Robert Browning."

Not having read the book, I can't really offer any further commentary.

Wikipedia makes a claim, apparently based on this article by the New York Times, that Randolph Henry Ash is based on Robert Browning and/or Alfred Lord Tennyson.

Not having read the book, I can't really offer any further commentary.