Whether those terms were or were not too favourable to France is quite another question.

It has often been maintained that she would have gained more by permanently annexing to herself Guipuscoa, Naples and Sicily than by sending the Duke of Anjou or the Duke of Berry to reign at the Escurial.
On this point, however, if on any point, respect is due to the opinion of William.

That he thoroughly understood the politics of Europe is as certain as that jealousy of the greatness of France was with him a passion, a ruling passion, almost an infirmity.

Before we blame him, therefore, for making large concessions to the power which it was the chief business of his life to keep within bounds, we shall do well to consider whether those concessions may not, on close examination, be found to be rather apparent than real.

The truth is that they were so, and were well known to be so both by William and by Lewis.
Naples and Sicily formed indeed a noble kingdom, fertile, populous, blessed with a delicious climate, and excellently situated for trade.
Such a kingdom, had it been contiguous to Provence, would indeed have been a most formidable addition to the French monarchy.