The Guardian of Education was the first successful periodical dedicated to reviewing children's literature in Britain. It was edited by 18th-century educationalist, children's author, and Sunday school advocate Sarah Trimmer and was published from June 1802 until September 1806 by J. Hatchard and F. C. and J. Rivington. The journal offered child-rearing advice and assessments of contemporary educational theories, and Trimmer even proffered her own educational theory after evaluating the major works of the day.
Fearing the influence of French Revolutionary ideals, particularly those of philosopher Jean-Jacques Rousseau, Trimmer emphasized orthodox Anglicanism and encouraged the perpetuation of the contemporary social and political order. Despite her conservatism, however, she agreed with Rousseau and other progressive educational reformers on many issues, such as the damaging effects of rote learning and the irrationalism of fairy tales.
The Guardian of Education was the first periodical to review children's books seriously and with a distinctive set of criteria. Trimmer's reviews were carefully thought out; they influenced publishers and authors to alter the content of their books, helped to define the new genre of children's literature, and greatly affected the sales of children's books. The Guardian also offered the first history of children's literature; establishing a list of landmark books, which scholars still use today.
Sarah Trimmer was prompted to publish The Guardian of Education by the flood of new children's books on the market early in the nineteenth century and by her fear that those books might contain French Revolutionary values. The 1790s had been one of the most tumultuous decades in Europe's history, with the French revolution, increased demands for reform in Britain, and the French Revolutionary Wars. Following this upsurge in radicalism, a conservative backlash erupted in Britain; the Guardian was, in many ways, a part of this movement. In its pages, Trimmer denounced the Revolution and the philosophers whose works she believed were responsible for it, particularly Jean-Jacques Rousseau. She argued that there existed a vast conspiracy, organized by the atheistic and democratic revolutionaries of France, to undermine and overthrow the legitimate governments of Europe. From her perspective, the conspirators were attempting to overturn traditional society by "endeavouring to infect the minds of the rising generation, through the medium of Books of Education and Children's Books" [emphasis Trimmer's]. She intended to combat this conspiracy by pointing parents towards properly Christian books.