Oxygenase that can act as both a histone lysine demethylase and a ribosomal histidine hydroxylase. Is involved in the demethylation of trimethylated 'Lys-9' on histone H3 (H3K9me3), leading to an increase in ribosomal RNA expression. Also catalyzes the hydroxylation of 60S ribosomal protein L27a on 'His-39'. May play an important role in cell growth and survival. May be involved in ribosome biogenesis, most likely during the assembly process of pre-ribosomal particles (By similarity). 2-oxoglutarate + L-histidyl-[ribosomal protein uL15] + O2 = (3S)-3-hydroxy-L-histidyl-[ribosomal protein uL15] + CO2 + succinate Binds 1 Fe(2+) ion per subunit. Belongs to the ROX family. MINA53 subfamily.