Paved roads in towns were usually gravel and sometimes cobble. They were frequently muddy because of rain and spillage of water being carried. Iron-shod wheels and overloaded carts made them very uneven. London was the first town with paviors. They cleaned and repaired the streets, filling up potholes with wood chips and compacting them with hand rams. The paviors were organized as a city company in 1479. About 1482, towns besides London began appointing salaried road paviors to repair roads and collect their expenses from the householders because the policy of placing the burden on individual householders didn't work well. London streets were lighted at night by public lanterns, under the direction of the mayor. The residents were to light these candle lanterns in winter from dusk to the 9 p.m. curfew. There were fire-engines composed of a circular cistern with a pump and six feet of inflexible hose on wheels pulled by two men on one end and pushed by two men on the other end. In 1480 the city walls were rebuilt with a weekly tax of 5d. per head. In schools, there was a renaissance of learning from original sources of knowledge written in Greek and rebirth of the Greek pursuit of the truth and scientific spirit of inquiry. There was a striking increase in the number of schools founded by wealthy merchants or town guilds. Every cathedral, monastery, and college had a grammar school. Merchants tended to send their sons to private boarding schools, instead of having them tutored at home as did the nobility. Well-to-do parents still sent sons to live in the house of some noble to serve them as pages in return for being educated with the noble's son by the household priest. They often wore their master's coat of arms and became their squires as part of their knightly education. Sometimes girls were sent to live in another house to take advantage to receive education from a tutor there under the supervision of the lady of the house. Every man, free or villein, could send his sons and daughters to school. In every village, there were some who could read and write. In 1428, Lincoln's Inn required barristers normally resident in London and the county of Middlesex to remain in residence and pay commons during the periods between sessions of court and during vacations, so that the formal education of students would be continuous. In 1442, a similar requirement was extended to all members. The book "Sir Gawain and the Green Knight" was written about an incident in the court of King Arthur and Queen Guenevere in which a green knight challenges Arthur's knights to live up to their reputation for valor and awesome deeds. The knight Gawain answers the challenge, but is shown that he could be false and cowardly when death seemed to be imminent. Thereafter, he wears a green girdle around his waist to remind him not to be proud.