hiː ɪstˈæblɪʃt ɐ θiəɹˈɛɾɪkəl faʊndˈeɪʃən fɔːɹ hˈɛɹəldɹi, ɪspˈɛʃəli baɪ kɹiːˈeɪɾɪŋ ɐn ˌʌndɚstˈændɪŋ fɔːɹ dˈʌtʃ tˈɜːmz.
He established a theoretical foundation for heraldry, especially by creating an understanding for Dutch terms.