Diffusion-based generative models, such as Denoising Diffusion Probabilistic Models (DDPMs), have achieved remarkable success in image generation.A new interpretable diffusion model called Patronus is introduced, which integrates a prototypical network into DDPMs.Patronus enhances interpretability by showing the learned prototypes and how they influence the generation process.The model supports downstream tasks like image manipulation and can reveal shortcut learning in the generation process.