Original: When Tropical Depression One formed on May 28, it marked the third time since 1851, when reliable records in the Atlantic basin began, that a pre-season cyclone developed in three consecutive years, following Subtropical Storm Andrea which formed in May of 2007 and Tropical Storm Arthur in May of 2008.
Simplified: The depression followed Subtropical Storm Andrea (2007) of May 2007 and Tropical Storm Arthur (2008) of May 2008.