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Jan Willem Drijvers, "Helena Augusta": the three legends that circulated about the finding of the Cross, the Helena legend, the Protonike legend and the Judas Kyriakos legend, with references to the contemporary sources

Catholic Encyclopedia: "True Cross," a Catholic view

OCA Synaxarion: Exaltation of the Cross, traditional Orthodox view

Fernand Cabrol, "The true Cross": a Catholic view

The Holy Cross in Jerusalem