My 6, 4, 1, renders the strongest man weak;

My 5, 3, 2, 1, is both pronoun and noun,

And my 5, 1, 2, often have builded a town;

To my 3, 5, 6, 4, 1, men sometimes have prayed,

And my 4, 6, 5, 1, through most forests have strayed;

My 6, 3, 5, has been to mystify you,

And devout men oft utter my 6, 5, 1, 2.

[Answer]

307.

(Fill the blanks with the names of British Authors.)