The efforts of Catherine's grandfather, Bela IV of Hungary to secure his southern boundary while moving toward the Adriatic included establishing leaders in Srem (John Angelos) and Slavonia (Rostislav Mikhailovich) who were not only capable but also closely connected to the royal family.
John Komnenos Doukas (died 1244), ruler of Thessalonica in 1237–1244, referred to as John Angelos in earlier literature
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John P. Angelos, Executive Vice President of the Baltimore Orioles
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