The author of the first text on chemistry is written through this sudoku-style puzzle

Solve this wordoku in the same way as a sudoku with letters instead of numbers (each of the nine letters in each row, column and nine-square cell). Once solved, one of the overall diagonals can be rearranged into the name of the person recognised as writing the first text on chemistry.

This week’s letters are: A B E H M O R S V