Final answer:
The main source of shame for Shahzaman prior to departing for a visit to his older brother's lands is the cruelty of his enslaver.
Step-by-step explanation:
The main source of shame for Shahzaman prior to departing for a visit to his older brother's lands is the cruelty of his enslaver. In the text, it is mentioned that Shahzaman had been living in free states, but was eventually enslaved and mistreated by someone. This caused him a great deal of shame and likely affected his self-esteem and sense of worth.