David. It appears from the parallel places of Samuel, that Jesse had eight sons, of whom David was the eighth and youngest; but one may have died before David came to the throne.

1 Samuel 16:10,11 Again, Jesse made seven of his sons to pass before Samuel. And Samuel said to Jesse, The LORD has not chosen these...

1 Samuel 17:12-14 Now David was the son of that Ephrathite of Bethlehemjudah, whose name was Jesse; and he had eight sons...