The more likely culprit would have been Sir Ranulf (Randolph) de Soules of Liddel (born c.1150 and murdered by his servants in 1207/8)
ðə mˈoːɹ lˈaɪkli kˈʌlpɹɪt wʊdhɐv bˌɪn sˌɜː ɹˈænʌlf ɹˈændɑːlf də sˈoʊlz ʌv lˈɪdəl bˈɔːɹn sˈiː.wˈʌn θˈaʊzənd wˈʌnhˈʌndɹɪd fˈɪfti ænd mˈɜːdɚd baɪ hɪz sˈɜːvənts ɪn wˈʌn θˈaʊzənd tˈuːhˈʌndɹɪd sˈɛvən slˈæʃ ˈeɪt