The wheellock is a type of firearm ignition mechanism that was developed in the early 16th century. It uses a rotating wheel to create sparks, igniting the gunpowder in the firearm. This innovation allowed for more reliable firing compared to earlier matchlock systems, which required a burning wick. Wheellocks were commonly used in pistols and long guns during the Renaissance period. They were often intricately designed and became popular among wealthy individuals and military officers. However, their complexity and cost eventually led to the decline of wheellocks in favor of simpler ignition systems like the flintlock.