Bells rung from the campanile served, for most of Christian history before mechanical and later electronic clocks became widely available, as one of the primary ways an entire town or parish learned what time it was and what was expected of it at that moment, calling the community to services, marking the canonical hours of prayer observed in monastic life, and tolling to announce a death, a fire, an invading army, or the joyful news of a festival, each occasion traditionally rung in its own recognizable pattern. This function made the campanile, and the specific rhythm of bells it produced, a genuinely civic as well as religious institution, since a town's daily and weekly rhythm of labor, rest and worship was often set in practice by when its church bells rang rather than by any independent civil timekeeping, a role bells retained in many communities well into the era of widespread mechanical clocks.
The Italian tradition of building the campanile as a freestanding tower, distinct from the church itself, spread with variation across other regions and traditions; some cultures instead integrated bell housing directly into a church's west towers or crossing tower, but wherever the bells were physically located, the underlying civic and liturgical function of marking sacred and communal time through sound remained essentially the same across medieval and early modern Christian Europe.