A dragon sits on top of the club 's crest and gave it its nickname of The Dragons .
The three of them have appeared in every one of Portugal 's Primeira Liga seasons since it was established in 1934 .
A dragon sits on top of the club 's crest and gave Portugal Portugal 's nickname of The Dragons .
The three of them have appeared in every one of Portugal 's Primeira Liga seasons since it was established in 1934 .