In the historical fiction novel, Aztec by Gary Jennings, Ahuitzotl is a prominent character. Set in the time just before the arrival of the Spanish Conquistadors, it accounts his construction of the many expansions of Tenochtitlan, and wars of conquest, trade, and proclivities.
Ahuitzotl, (died 1502, Tenochtitlán [Mexico]), eighth king of the Aztecs, under whose reign (1486–1502) the Aztec empire reached its greatest extent. The aggressive Ahuitzotl succeeded his brother, Tizoc, to the throne.
Ahuitzotl Name Glyph. Lucas (CC BY) Ahuitzotl (Auitzotl) was an Aztec ruler who reigned between 1486 and 1502 CE. He was one of the greatest generals of the ancient Americas and he left to his nephew, Montezuma, an enlarged and consolidated empire which had been ruthlessly terrorised into submissive acceptance of Aztec rule.
Region. Lake Texcoco  The ahuizotl (from the Classical Nahuatl: āhuitzotl for "spiny aquatic thing", a.k.a. "water dog") is a legendary creature in Aztec mythology.  It is said to lure people to their deaths.  The creature was taken as a mascot by the ruler of the same name, and was said to be a "friend of the rain gods". 
Ahuitzotl was a tlatoani (meaning ‘speaker’) of the city of Tenochtitlan, and the eighth ruler of the Aztec Empire. This emperor reigned from 1486 AD to 1502 AD, a period which is regarded by some modern historians as the Aztec Golden Age.
The Ahuízotl is thought by some investigators to be a mythical animal, bane of the water goers. It would lie in wait of a victim who, once in its sights, would be pulled into the water by the head on the end of the Ahuízotl’s tail. After a struggle that threw up fish, frogs and frothy water, the human was dragged below the surface and drowned.
Ahuitzotl was the eighth king, or emperor, of the Aztec people. His name means “Water Beast.” Ahuitzotl reigned from 1486 to 1502. Under his rule, the Aztec Empire grew larger than it had ever been.
Ahuitzotl is known mainly for bringing about the greatest human sacrifice in Aztec history. In 1487 he decided to dedicate his newly completed temple at Tenochtitlán. The ceremonies, lasting four days, consisted of prisoners of war forming four lines, each one extending over three miles.
Ahuitzotl ( Nahuatl languages: āhuitzotl, Nahuatl pronunciation: [aːˈwit͡sot͡ɬ] ⓘ) was the eighth Aztec ruler, the Huey Tlatoani of the city of Tenochtitlan, son of princess Atotoztli II. His name literally means "Water Thorny" and was also applied to the otter.
Description. kelpie. The Ahuizotl in Myth. In mythology the ahuizotl is said to be a friend of the rain gods and a guardian of the lakes. Its purpose is often said to be to protect the fish within the lakes. But in other myths it is said to be sent down by the gods Tlāloc and Chalchiuhtlicue to collect the souls of the mortals the gods liked.