Final answer:
The question is about a false identity that yielded a sum of money to a king. Although the specific false identity is not provided, historical examples of impostors claiming royal lineage can shed light on this topic.
Step-by-step explanation:
The false identity that yielded the king $87.75 is not directly mentioned in the given information. However, it seems that the question is referring to a historical event or figure who used a false identity to gain monetary benefits from the king.
One example of a historical event involving false identity and monetary gain is the case of impostors during the medieval period, such as Lambert Simnel or Perkin Warbeck. These impostors claimed to be the rightful heirs to the English throne and gained support from powerful individuals who sought to overthrow the ruling king. They were able to receive financial backing from their supporters in an attempt to seize power.
It is worth noting that without specific details or context related to the question, it is difficult to provide a specific answer. However, historical examples of false identities used for gain can help provide insight into how such situations have occurred in the past.