Who is Squire Zhao from Water Margin and what is their importance?

Squire Zhao is the wealthy man who marries Jade Lotus after she and her father escape from Zheng with Lu Da's help. Because of his gratitude for Lu Da, he arranges for Lu Da to have a place in a monastery so he can assume a different identity and avoid being arrested for the death of Zheng. Zheng also arranges another place for Lu Da to stay after he twice creates a ruckus at Mount Wutai. Zheng also repays the monks for the damage that Lu Da has done at the monastery.