A chaise of four

Hi, I'm reading Pride and Prejudice. In Chapter 1 Mr. Bingley arrives "in a chaise of four". Is it of four seats, four horses, or four wheels, I wonder? It'll be much appreciated if some relevant links are provided together with the answer. Thanks a lot!

chaise and four: chaise is a type of carriage; it seated three people, all facing forward, and was enclosed (see illustration on p. 397). Four refers to the number of horses pulling it. A chaise was a popular vehicle for long-distance travel, so it would be a logical one for someone coming from far away to use (in this case, as we find out later, it happens to be the carriage Mr. Bingley owns and uses regularly).