Diophantus II.VIII
The eighth problem of the second book of Arithmetica by Diophantus (c. 200/214 AD – c. 284/298 AD) is to divide a square into a sum of two squares. == The solution given by Diophantus == Diophantus takes the square to be 16 and solves the problem as follows: To divide a given square into a sum of two squares.