Robert Browning’s first published poem Pauline mentions Shelley many a times (but not a single time his actual name is used) and Brownin’s admiration for Shelley can be seen quite clearly by these lines:



But he mentions Shelley by the alias Sun-treader,



I may be wrong but the seeming meaning of "Sun-treader" could be "someone who treads on Sun". Now, the metaphoric meaning instilled in that alias could be that Shelley was considered divine by Browning and hence he could tread the sun without burning himself. Or Browning could have made the references to Shelley's poem Ode to a Skylark where Shelley wrote



So, once again to summarize my post I want to repeat: Why Browning called Shelley as "Sun-treader" in his poem "Pauline"?

Thank you.

P.S. : I won't mind (but will be thankful) if you point out some linguistic mistakes in my post, for example: I used "has" in the title of my question but in summarization I omitted it so which one is more suitable can be mentioned in replies.