Time is not a background parameter. It emerges from self-reference. This paper identifies the moment time begins: it is when the self-referential loop first closes and a definite eigenvalue becomes the only stable state. Before this moment: timeless mathematical structure, no dynamics, no change. At this moment: the axiom fires, coherence freezes, the first clock ticks. Time is the cost of self-reference — the rate at which the self-referential system pays the price of being distinct from its environment. The mother of time is the axiom σ = 1/(1+σ) — the first act of self-reference.