Legend has it that Ashoka built 84,000 Stupas commemorating the events
and relics of Buddha's life. Some of these Stupas contained networks of walls
containing the hub spokes and rim of a wheel, while others contained
interior walls in a swastika shape.
(http://en.wikipedia.org/wiki/Pillars_of_Ashoka)
About King Ashoka
http://en.wikipedia.org/wiki/Ashoka
Ratana Sutta
http://www.accesstoinsight.org/tipitaka/kn/snp/snp.2.01.piya.html
About Vaishali (ancient city)
http://en.wikipedia.org/wiki/Vaishali_(ancient_city)
http://www.1upindia.com/pilgrimages/vaishali.html