Because of her court connections, Joanna may have been the source of what some consider to be Luke’s inside information about Herod Antipas, especially since Luke is the only Gospel writer who mentions her by name. ​ — Luke 8: 3; 9: 7 - 9; 23: 8 - 12; 24: 10.
Johanna võis olla see, kes tänu oma sidemetele Herodes Antipase õukonnas võis Luukasele edasi rääkida mingit siseinfot Herodese kohta.