|Stable release||1.0 Release Candidate 3 / Sep 20th, 2007|
The project was founded by Hamilton Verissimo de Oliveira (Hammett), who was a member of the Apache Avalon and the Apache Excalibur projects. Keenly interested in the development of an Inversion of Control container, after he resigned from Avalon and became disillusioned with Excalibur, he went on to develop and release his own for the .NET platform.
Hammett was joined by other developers, after the publishing of a series of articles   on The Code Project and the Castle Project eventually expanded its mission "to provide a simple set of tools to speed up the development of common enterprise and web applications while promoting good architecture". 
The Castle Project still continues to gain acceptance and mind-share from the .NET community, including recognition from Microsoft thought leaders as a framework to assist with building "robust, extensible, working software". 
In 2006 Hammett started his own company to offer commercial support for the Castle Project and for the applications developed using the framework. In August 2008 he joined Microsoft as a Program Manager on the MEF team.
On October 31st, 2008 Hamilton announced  on his blog that Castle Project has been split, and all subprojects will be maintained and released independently since that date.
The first project to be released after the split was DynamicProxy, on May 4th, 2009 .