They

Chamber's Twientieth Century Dictionary · 1908 · p. 110

th ā, pers. pron. , pl. of he , she , or it . [The form the i , tha , that came into use in the north of England in the 13th cent., replacing the older hi , heo . It is the A.S. þá , nom. pl. of the definite article, prob. modified by Scand in avian influence.]