Final answer:
The subject matter of Francisco Goya's painting 'Meadow of San Isidro, 1788' cannot be determined, but his most famous painting related to Spanish resistance to Napoléon is 'The Third of May 1808'.
Step-by-step explanation:
The subject matter of Francisco Goya's painting 'Meadow of San Isidro, 1788' cannot be determined. The information provided does not indicate the specific subject matter of this painting. However, it is important to note that Goya's most famous painting related to Spanish resistance to Napoléon is 'The Third of May 1808', which depicts the French reprisals against Spanish rebels during the Peninsular War.