The Chilam Balam also accounts for a second occupation which took place in the 10th century, when the Toltec influenced Nahua arrived and left traces in the buildings of Uxmal. The records show he arrived in 987 with the virtuous Xiues in 987 to 1000. With them brought Toltec flavor, Kukulkan, Tloc even thought Maya had Chac, needed for rain, Mexican features can be seen on the mask.