Quite an interesting question you’re presenting! However there is something to be said against it. Let’s take the bull by the horns.
Matajudíos is not a province in Sevilla: Sevilla is both a province (one of the eight provinces of the autonomous region Andalusia: Almería, Cádiz, Córdoba, Granada, Huelva, Jaén, Málaga and Sevilla) in Spain and the name of its county town.
And now the name. The first part, the noun "mata" has several meanings:
1 – bush,shrub 2 – bunch, bundle, shock (of hair) 3 – portion of land covered with trees of the same species 4 – (in Latin America) plant
The second part "Judíos" indeed means "Jews".
However, here "mata" is a conjugated form (third-person singular) of the verb MATAR, which meansto kill, murder, slay, shoot, slaughter, destroy, butcher, swat, cut down, lay, dispose of, knock off …and similar decent activities. Thus, "Matajudíos" is not (the name of) a conclave nor Anton Martín Padilla’s name or surname, but his nickname:
Anton Martín Padilla, the Jews-slayer.
Compare it with the famous El Cid, el "Matamoros", the Moor-slayer: you’ll remember the famous historical epic film El Cid (1961), a highly romanticized story of the life of the Castilian knight El Cid, starring Charlton Heston and Sophia Loren.