The song is from novel Song of Ice and Fire (or more popular series Game of Thrones).
It is a song referring a battle of Castamere, between the disobedient Lord Reyne of Castamere and his liege lord Tywin Lannister. The history here is that Rayne family were disrespectful to their liege lord of Tytos Lannister (Tywin’s father) by dissonance and ignoring to pay their loans or taxes. The sigil of House of Lannisters is the Lion, but also House of Reyne has red lion on their sigil (in Westeros is common protected families to have similar sigils as their liege lord’s houses).
In the first part of the song the “proud lord” Reyne speaks to Tywin Lannister:
And who are you that I must bow so low?
Only a cat of a different coat, that's all the truth I know.
In a coat of gold or a coat of red,
a lion still has claws,
And mine are long and sharp, my lord,
as long and sharp as yours.
He is speaking ignorantly to his liege lord, referring that Lannisters are nothing more important than his House and their strength.
However the song is written to hail the victory of Lannisters and in the next part of the song the verse refer the complete destruction of the House of Reyne
But now the rains weep o'er his hall,
with no one there to hear.
Meaning literally his castle is destroyed, and the great hall (every castle has one of those) is over open sky, and no one is there meaning they are all dead.
The song is from novel Song of Ice and Fire (or more popular series Game of Thrones). It is a song referring a battle of Castamere, between the disobedient Lord Reyne of Castamere and his liege lord Tywin Lannister. The history here is that Rayne family were disrespectful to their liege lord of Tytos Lannister (Tywin’s father) by dissonance and ignoring to pay their loans or taxes. The sigil of House of Lannisters is the Lion, but also House of Reyne has red lion on their sigil (in Westeros is common protected families to have similar sigils as their liege lord’s houses). In the first part of the song the “proud lord” Reyne speaks to Tywin Lannister: And who are you that I must bow so low? Only a cat of a different coat, that's all the truth I know. In a coat of gold or a coat of red, a lion still has claws, And mine are long and sharp, my lord, as long and sharp as yours. He is speaking ignorantly to his liege lord, referring that Lannisters are nothing more important than his House and their strength.
However the song is written to hail the victory of Lannisters and in the next part of the song the verse refer the complete destruction of the House of Reyne But now the rains weep o'er his hall, with no one there to hear. Meaning literally his castle is destroyed, and the great hall (every castle has one of those) is over open sky, and no one is there meaning they are all dead.
Refrences: http://gameofthrones.wikia.com/wiki/The_Rains_of_Castamere