I will add more detailed information on Lorenzo di Niccolo's life, work, and significance. The article will become more focused through improved and extensive use of sources.

Example Sources:

https://www.jstor.org/stable/860950?seq=1#page_scan_tab_contents

http://www.artnet.com/artists/lorenzo-di-niccolò/past-auction-results

http://www.oxfordartonline.com/subscriber/article/grove/art/T051961?q=Lorenzo+di+Niccolo&search=quick&pos=2&_start=1#firsthit

Cole, Bruce. "A New Work by The Master of The Arte Della Lana Coronation." The Burlington Magazine 110, no. 781 (1968): 215-14. http://www.jstor.org/stable/875587.

B. Cole: ‘A New Work by the Young Lorenzo di Niccolò’, A. Q. [Detroit], xxxiii (1970), pp. 114–19 

E. Fahy: ‘On Lorenzo di Niccolò’, Apollo, cviii (1978), pp. 374–81