This paper proposes that the proclamation of John the Baptist, gathered from its full canonical witness across the four Gospels, exhibits a coherent proleptic architecture: an announced eschatological horizon (the kingdom of heaven), a governing hub (the Lordship of the coming one, itself including a substitutionary dimension disclosed through the Johannine witness), five responsive elements structured around that hub (repentance, baptism, fruit, judgment, and the Holy Spirit), and an epistemic ground beneath the whole structure (testimony). “Proleptic” is used here to denote content that appears in undeveloped, seed form within John's proclamation and that later revelation unfolds explicitly — anticipatory in substance, not merely typological or chronological. The study proceeds by explicit canonical-thematic method, treating the Synoptic and Johannine witnesses as complementary theological testimony to a single historical figure's proclaimed content, following the canonical-critical precedent associated with Childs (1979, 1992) ^{[2, 3]}. The paper states clear inclusion criteria for the template's elements, defends the Lordship-over-Kingdom hub against the strongest available objection, situates the template against a broadened field of prior scholarship, and traces its continuity into the wider New Testament witness before naming its deliberate limits.