The term "Great Houses" refers to powerful noble families in the fictional world of Westeros, created by George R.R. Martin in his series, "A Song of Ice and Fire." These families, such as House Stark and House Lannister, hold significant political influence and control vast territories. Each house has its own unique sigil, motto, and history, which contribute to its identity and legacy. Great Houses often engage in alliances, marriages, and conflicts to expand their power and secure their interests. The dynamics between these houses shape the political landscape of Westeros, leading to intricate plots and rivalries that drive the narrative of the series.