For 10 points, name this possessory interest of feudal landowners.
This word, when coupled with primer, denoted the right of the king to take a whole year worth of an estate's production whenever this interest was transferred. In order to transfer this type of interest between living people, the owner in it would pick up a clod and a twig from the ground and give it to the new owner in the presence of witnesses in a namesake "livery." For 10 points, name this possessory interest of feudal landowners.
This word, when coupled with primer, denoted the right of the king to take a whole year worth of an estate's production whenever this interest was transferred.
seisin [accept word forms like being seised in the land]