Times Without Number

Description for TIMES WITHOUT NUMBER by John Brunner:

A STITCH IN TIME

Four centuries have passed since the Spanish Armada's glorious defeat of England, and the subjects of the Spanish Empire were, by and large, proud to be in it. And the men of the Society of Time were dedicated to keeping things that way.

But corrupt officers of that Society were using time travel to make a little profit on the side; the Indians of the New World longed to be masters of their own lands; and somehow, Amazons had come through time to assassinate the Imperial Prince. Soon, Don Miguel Navarro---junior officer in the Society of Time---faced a threat to all of history...