This is the strict technical expression used to describe the ownership in “an estate in fee-simple in possession in a corporeal hereditament.” The word “seised” is used to express the “seisin” or owner’s possession of a freehold property: the phrase “in de mesne,” or “in his demesne,” (in dominico suo) signifies that he is seised as owner of the land itself, add not merely of the seigniory or services; and the concluding words, “as of fee,” import that he is seised of an estate of inheritance In fee-simple. Where SEISI 101 the subject is incorporeal, or the estate expectant on a precedent freehold, the words “in his demesne” are omitted. (Co. Litt. 17a; Fleta, 1. 5, c. 5,