Based on the clue 'around 900 the toltec leader cloud serpent sacked ...', what is the answer?

Based on the clue 'around 800 this holy roman emperor established a s...', what is the answer? Based on the clue 'around 841 the vikings established a settlement at...', what is the answer? Based on the clue 'around 9 pounds at birth the pygmy species of this...', what is the answer? Based on the clue 'around 900 ad the toltec indians set up an empire ...', what is the answer? What is associated with: around 9000 bc herds of these large wild cattle dramatically increased became a major food sou… Based on the clue 'around 950 bc a libyan military officer seized thi...', what is the answer? Based on the clue 'around 957 english king edgar made the monk dunsta...', what is the answer? Based on the clue 'around 965 bc cedar trees from lebanon were used t...', what is the answer?