quintain (n.) Look up quintain at Dictionary.com
"target for tilting and jousting practice," c. 1400 (in Anglo-Latin from mid-13c.), from Old French quintaine or directly from Medieval Latin quintana; perhaps from Latin quintana "of the fifth" (see quinque-), which as a noun meant "the business part of a camp," on the supposition that this was where military exercises were done [OED].