Joomla 1.5

History: -

It was released on January 22, 2008. The last release of this version was 1.5.26 on March 27, 2012. It was first version to attain long term support (LTS).
LTS versions are released each three major or minor releases and are supported until three months after the next LTS version is released

What is Joomla?

Joomla is one of the world’s most popular open source Content Management System