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I don't have enough context to provide an accurate overview of "738." The only information provided is that it relates to a "year," but without additional details about what specifically happened in 738 or why it matters historically, I cannot write an informed overview without risk of inaccuracy.
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Map of Maya area, with location of Copán Stela of Uaxaclajuun Ub'aah K'awiil
Year 738 (DCCXXXVIII) was a common year starting on Wednesday of the Julian calendar, the 738th year of the Common Era (CE) and Anno Domini (AD) designations, the 738th year of the 1st millennium, the 38th year of the 8th century, and the 9th year of the 730s decade. The denomination 738 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.