the shields displayed outside each tent heralded its occupant : the silver eagle of seagard , bryce caron 's field of nightingales , a cluster of grapes for the redwynes , brindled boar , red ox , burning tree , white ram , triple spiral , purple unicorn , dancing maiden , blackadder , twin towers , horned owl , and last the pure white blazons of the kingsguard , shining like the dawn .