This thesis looks into the analysis of iconography of the northern lateral portal of the Church of Our Lady before Týn. For this purpose this thesis summarizes the most important historiographical, Artististic Science and source literature related to this relic. Based on researched iconographic analysis this thesis aids to propose all possible solutions iconographic programme which could have been intended for this thesis. Based on the evaluation of literature, sources and on the formal analysis principal the objective of this thesis is to specify significantly problematic dating range (approximately from mid. 13th century up to late 1450) to shorter period of possible origin of the artwork there are also evaluated all available restauration reports and construction historical surveys related to the inspected relic.