New Delhi, Nov. 6 -- Widely regarded as one of the greatest soccer players of all time, the 41-year-old forward announced Thursday he was done playing for the national team.

Here's a look at the defining milestones of Ronaldo's 23-year career with Portugal's national team.

Ronaldo's timeline with Portugal

Aug. 20, 2003: Made his Portugal debut as an 18-year-old in a 1-0 friendly win against Kazakhstan.

June 12, 2004: Scored his first international goal in a 2-1 loss against Greece in the opening match of the European Championship. The date also marked his first appearance at a major senior tournament.

June 17, 2006: Scored his first World Cup goal by converting a penalty kick in Portugal's 2-0 win over Iran in the tournament in Germa...